Hi, my name is jack, I'm 14 years old, and I love Baseball. I would like to know when a pitcher throws a baseball, how does it curve?

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• Hi, my name is jack, I'm 14 years old, and I love Baseball. I would like to know when a pitcher throws a baseball, how does it curve?
• How far away from an explosion do I have to be to be safe enough to walk like a cool guy and not look at it?
• Why is -1 times -1 equal to +1 and not -1 or something totally different?
• what is the process for writing data on a cd and how do dvd players read the data?
• In a vacuum, will an electron cloud expand to fill a volume like a gas?
• Can I repeatedly donate my liver since it can completely regenerate?
• Why aren t we using onboard laser for propulsion?
• How different would be the universe if force fields, specifically electromagnetic and gravitational, decayed not by the square but linearly with distance?
• How did engineers/machinists create the first precise straight edge?
• What is the diameter of a bolt of lightning?
• Why don't I, as an adult, seem to get earaches anymore? They seemed common as a child, but I've never had one after my preteen years.
• Why does a camera obscura/pinhole camera work?
• Why do fireworks make different sounds?
• Tourette syndrome was first described in 1885; surely the syndrome was an object of reality for many people around the world, before the first case was diagnosed. So why was it not diagnosed earlier?
• How do efficient video codecs like HEVC and VP9 work?
• One technique astonomers use to discover new planets is by looking at the "wobble" of the star it is orbiting. Is there an assumption that there is the only one planet orbiting the observed star and if not, how do they determine the qualities, like mass, of the planet without the assumpion?
• Is the strength of gravitational pull in planets only defined by it's size, or does the density of the material it mostly consists of affect aswell?
• There are many animals that dance. Are there any animals that dance to music ?
• Can non-ionized radiation cause genetic mutations?
• When polling controversial topics, is there a "too shy to admit bias"?
• Can something escape a Black Hole (after crossing the threshold) by being pulled by a nearby gravity?
• When I undo an action on a word document, does it run the action in reverse or revert to a saved copy of what the document was like before the action?
• Could an alien civilization on Proxima B discover Earth using the same technology we used to discover Proxima B?

Hi, my name is jack, I'm 14 years old, and I love Baseball. I would like to know when a pitcher throws a baseball, how does it curve? Posted: 30 Aug 2016 10:53 AM PDT I found this gif on my front page as soon as I made an account here so it kind of helps me make the question more clear. Here is a pitcher throwing what is known to be a "Knuckleball" and it has a lot of breakdown to it, I want to know what makes a ball curve like this. https://gfycat.com/WhichUnnaturalAsianlion Thank you everyone. And remember science rules! submitted by /u/poptartfarts13 [link] [comments]

How far away from an explosion do I have to be to be safe enough to walk like a cool guy and not look at it? Posted: 31 Aug 2016 04:11 AM PDT submitted by /u/floodedyouth [link] [comments]

Why is -1 times -1 equal to +1 and not -1 or something totally different? Posted: 31 Aug 2016 05:12 AM PDT submitted by /u/Smirgl [link] [comments]

what is the process for writing data on a cd and how do dvd players read the data? Posted: 31 Aug 2016 05:21 AM PDT 'Computing' Sorry im 13 and my English is patchy at times. Thank you in advanced :) submitted by /u/Billy-Heffernan [link] [comments]

In a vacuum, will an electron cloud expand to fill a volume like a gas? Posted: 31 Aug 2016 06:33 AM PDT submitted by /u/pimpmastahanhduece [link] [comments]

Can I repeatedly donate my liver since it can completely regenerate? Posted: 31 Aug 2016 07:07 AM PDT IIRC that the liver is the only organ capable of regenerating completely. And should I? submitted by /u/Lew_ [link] [comments]

Why aren t we using onboard laser for propulsion? Posted: 31 Aug 2016 01:49 AM PDT So if we can use laser (on ground) to accelerate a spacecraft, wouldn t it be possible to mount that laser onto the spacecraft and shooting it at earth to get thrust? And wouldn t that mean we could accelerate in space only with electricity? And if we dont get thrust by shooting a laser into space, couldn t we just point that laser on a solar sail or something to get thrust from the sail? Am I missing something? submitted by /u/BROTTEIG [link] [comments]

How different would be the universe if force fields, specifically electromagnetic and gravitational, decayed not by the square but linearly with distance? Posted: 31 Aug 2016 04:11 AM PDT It's a pretty useless hypothetical question, but it sounded interesting during the morning ride. submitted by /u/WeissUndHell [link] [comments]

How did engineers/machinists create the first precise straight edge? Posted: 30 Aug 2016 04:28 PM PDT If I had to create a good straight edge from scratch, my first thought would be to pour molten tin on top of molten glass for a flat surface, then fold the cooled tin sheet, as it seems from experience that folding creates a straight edge, though I've never heard how precise it is. But I assume the above process for making a flat surface may not have been known in antiquity, so I'm wondering how and if they did it. submitted by /u/darien_gap [link] [comments]

What is the diameter of a bolt of lightning? Posted: 30 Aug 2016 06:34 PM PDT What is the diameter of a bolt of lightning? Is it even a circle, or does it vary in shape or size, and if it does, what kind of variables factor into this? submitted by /u/27will4ndrews27 [link] [comments]

Why don't I, as an adult, seem to get earaches anymore? They seemed common as a child, but I've never had one after my preteen years. Posted: 31 Aug 2016 07:08 AM PDT Is it just a cognitive bias on my part? I don't know any adults that have ever had or talked about having earaches after childhood. submitted by /u/clyde2003 [link] [comments]

Why does a camera obscura/pinhole camera work? Posted: 31 Aug 2016 12:56 AM PDT From what I understand of the rectilinear prorogation of light, ray of light travel straight and I'm assuming parallel to each other unless they are scattered by the particles in the atmosphere. The usual representation of how camera obscura works is represented like this but in reality it shouldn't it be like this instead. I know scatterings got to do something with it. The way I imagine it is that light is scattered in every angle lowering its intensity and the pinhole just let's the scattered light in a so that an image is formed like this. But if that's the case shouldn't the middle part where the pinhole is be brighter than the rest if the image like this? What am I missing? submitted by /u/igotsbrains [link] [comments]

Why do fireworks make different sounds? Posted: 31 Aug 2016 12:51 AM PDT submitted by /u/Xelestis [link] [comments]

Tourette syndrome was first described in 1885; surely the syndrome was an object of reality for many people around the world, before the first case was diagnosed. So why was it not diagnosed earlier? Posted: 31 Aug 2016 06:37 AM PDT submitted by /u/MiiisssterMiiissster [link] [comments]

How do efficient video codecs like HEVC and VP9 work? Posted: 31 Aug 2016 02:30 AM PDT What "magic" does HEVC use to get excellent quality at similar filesizes to h.264? Also, I've heard that it's possible to encode a video mathematically losslessly in HEVC. While lossy audio and images are of course much smaller in filesize than lossless ones, is the same thing true for HEVC video? Also, given the efficiency of these codecs, why are software-only decoders regarded as a bit "slow"? I understand this approach may be slower than native hardware support, however, comparing purely software based implementations, does HEVC not show a great benefit over h.264 in regards to bandwidth and the like? Thank you! submitted by /u/blueredscreen [link] [comments]

One technique astonomers use to discover new planets is by looking at the "wobble" of the star it is orbiting. Is there an assumption that there is the only one planet orbiting the observed star and if not, how do they determine the qualities, like mass, of the planet without the assumpion? Posted: 31 Aug 2016 06:10 AM PDT submitted by /u/Suavedra [link] [comments]

Is the strength of gravitational pull in planets only defined by it's size, or does the density of the material it mostly consists of affect aswell? Posted: 30 Aug 2016 06:06 PM PDT For example, since Jupiter is a planet mostly made of gas, if we had another planet that was exactly the same size but was consisted mostly of a material that is more dense, would its gravitational pull be stronger? submitted by /u/Arislash [link] [comments]

There are many animals that dance. Are there any animals that dance to music ? Posted: 30 Aug 2016 08:43 PM PDT Dancing spiders, birds being the most obvious examples. Any animals "feel the beat"? submitted by /u/RobBobGlove [link] [comments]

Can non-ionized radiation cause genetic mutations? Posted: 31 Aug 2016 05:16 AM PDT So it's well known ionized radiation like ultraviolet can cause genetic mutations, but can something with less energy like radio waves cause mutations? submitted by /u/JoeRmusiceater [link] [comments]

When polling controversial topics, is there a "too shy to admit bias"? Posted: 30 Aug 2016 11:32 AM PDT Sometimes polls are about controversial topics and people hide their true opinion. So when they make polls per telephone there might be a strong bias. Is this considered in good polls? Is this just a marginal effect? submitted by /u/downvotello [link] [comments]

Can something escape a Black Hole (after crossing the threshold) by being pulled by a nearby gravity? Posted: 30 Aug 2016 02:26 PM PDT I'm not well versed in relativity, but I think that things can't escape a black hole once they cross a certain threshold because their escape velocity becames higher than the speed of light. However, say if after an object enters such threshold, something like a star was pulled near the black hole, couldn't its gravity pull the object back through the old threshold? In other words, couldn't the escape velocity became lower (than the speed of light) if a star comes close enough to the hole? submitted by /u/ElGordoFreeman [link] [comments]

When I undo an action on a word document, does it run the action in reverse or revert to a saved copy of what the document was like before the action? Posted: 31 Aug 2016 03:57 AM PDT submitted by /u/Hazzabazza10078 [link] [comments]

Could an alien civilization on Proxima B discover Earth using the same technology we used to discover Proxima B? Posted: 30 Aug 2016 11:35 PM PDT As has been widely reported, scientists recently announced that an Earth-like planet has been discovered around one of our closest neighboring stars, Proxima Centari, using techniques that look for wobble/Doppler shift of the parent star. My question is, would a theoretical alien civilization on Proxima B, using similar techniques and technology as our own, be able to detect the presence of Earth? We have 8 planets in our own solar system, all perturbing the sun to some degree, so is their a technique to screen out large gas giants, like Jupiter and Saturn, from the relatively small Earth and Mars? submitted by /u/mclumber1 [link] [comments]

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Does the dark matter in a galaxy form a disk or a sphere?

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• Does the dark matter in a galaxy form a disk or a sphere?
• Wikipedia says that on very long timescales, "all matter is liquid". What does this mean, how does it work?
• What are the alternative ways to measure advancements of civilisation other than the Kardashev Scale, and what are their pros and cons?
• Can a planet's orbit cross the surface of a star? Could it orbit entirely within it?
• Consider a machine which uniformly generates random real numbers in the range [0, 1]. Would the set of all possible outputs include numbers with a finite number of digits?
• How many sieverts/rads would you get per second if you were spacewalking without a suit?
• What do liquid hydrocarbons look like?
• The Boeing new 737Max has a winglet that save 1.8% on fuel. How is that possible when it also adds drag?
• If you add magnets to car wheels (use their spinning as a turbine) would it be possible to produce electricity and thus reduce the usage of fuel or just create a self-sustainable electric car?
• What non-biological factors contribute to regional soil fertility?
• Is there any simple explanation in terms of spacetime for why c is invariant in every inertial reference frame?
• How can something be redox inactive?
• How do they keep radiation from contaminating the water which evaporates out of the top Nuclear Power Plants?
• When I use a nail clippers and cut a little chunk of skin off the end of my thumb, what am I cutting? Is it skin?
• Why is it possible to recover data from a drive after a zero-fill?
• Does Heisenberg's Uncertainty Principle imply that we will never need to determine the position of an electron?
• With people that have brown/blue eyes, is their a difference between nighttime vison?
• What issues would be be worried about if we were experiencing global cooling, instead of global warming?

Does the dark matter in a galaxy form a disk or a sphere? Posted: 30 Aug 2016 03:39 AM PDT Ordinary matter in most galaxies forms a disk. Does the dark matter also collapse into the same disk or does it remain a big blobby sphere around the center of a galaxy due to its lack of interaction through forces other than gravity? submitted by /u/Speterius [link] [comments]

Wikipedia says that on very long timescales, "all matter is liquid". What does this mean, how does it work? Posted: 29 Aug 2016 06:56 PM PDT From this article, if you scroll down the timeline to 1065 there's the following description: Assuming that protons do not decay, estimated time for rigid objects like rocks to rearrange their atoms and molecules via quantum tunneling. On this timescale, all matter is liquid. I vaguely understand how quantum tunneling works, and how it might allow particles to move over time, but why is all matter described as liquid? What would it look like if you were able to set up a (very very) long time lapse video of a rock, or a planet? submitted by /u/007T [link] [comments]

What are the alternative ways to measure advancements of civilisation other than the Kardashev Scale, and what are their pros and cons? Posted: 30 Aug 2016 06:32 AM PDT On the back of the recent Alien hype a lot has been publicised about the Kardashev Scale. While I'm no scientist, I noticed this all assumes the evolution of a civilisation is based purely on how well they capture energy from their sun (though I see this as being the easiest for us to observe from Earth). I'm wondering if this is the best method out there, what other methods exist and what are the pros and cons of each? Thanks :) submitted by /u/holman8a [link] [comments]

Can a planet's orbit cross the surface of a star? Could it orbit entirely within it? Posted: 29 Aug 2016 09:30 PM PDT If a star is in it's quick expand-contract-expand-contract phase (on the order of tens or hundreds of thousands of years), what would happen? When it expands, the mass would not increase, but its radius would. It's Roche limit would stay the same or decrease. How long would a planet be able to orbit within it? I'm assuming that, even completely molten, it can still stay together because the density would be low. It would be high enough to cause significant drag, though. submitted by /u/masasin [link] [comments]

Consider a machine which uniformly generates random real numbers in the range [0, 1]. Would the set of all possible outputs include numbers with a finite number of digits? Posted: 29 Aug 2016 06:16 PM PDT Possibly excluding 0 and 1? submitted by /u/rryderr [link] [comments]

How many sieverts/rads would you get per second if you were spacewalking without a suit? Posted: 29 Aug 2016 10:33 PM PDT I'm wondering exactly how much radiation one would be exposed to if they were in space without a space suit (perhaps beside the ISS). I can find readings for astronauts throughout an entire mission as well as a theoretical mission to Mars (0.66 sievert), but I can't seem to find anything on how much you would get if you were drifting in space without a suit. submitted by /u/ruhtraeel [link] [comments]

What do liquid hydrocarbons look like? Posted: 29 Aug 2016 06:29 PM PDT I know that Titan has lakes/oceans of it, but I don't know what they look like other than just big things of dark liquid. I couldn't find any good pictures of lab-based liquid hydrocarbons, but I would like to get an idea of what "dropping a sub" into it would look like. submitted by /u/Deminixhd [link] [comments]

The Boeing new 737Max has a winglet that save 1.8% on fuel. How is that possible when it also adds drag? Posted: 29 Aug 2016 01:21 PM PDT I just saw this claim in an ad/"news" piece. I understand that a winglet adds drag, simply because it exists. How does it achieve a fuel saving? Is that the purpose of all winglets? submitted by /u/vertebrate [link] [comments]

If you add magnets to car wheels (use their spinning as a turbine) would it be possible to produce electricity and thus reduce the usage of fuel or just create a self-sustainable electric car? Posted: 30 Aug 2016 06:07 AM PDT submitted by /u/proofmastah [link] [comments]

What non-biological factors contribute to regional soil fertility? Posted: 29 Aug 2016 02:21 PM PDT I'm looking to develop a simplified model for estimating soil fertility across arbitrary, random terrains that are generated by a computer program. I'd like to understand what geographical and geological factors are predictive of soil fertility in the real world, in order to make my model reasonably believable-looking. As a non-scientist, the things I can think of are: Water - terrain closer to and downhill of water, especially freshwater, would seem to be more fertile Temperature - Hotter areas would evaporate faster, mitigating the effects of nearby water sources Volcanism - Volcanic ash, I understand, can be very helpful to plant growth Wind - I would assume areas with more wind suffer from more erosion, and that plants and rich soils have a harder time establishing there. On the other hand, wind that originates over water would carry rainclouds, increasing fertility Am I missing or overestimating certain factors? What other aspects of the shape, history, and composition of a piece of terrain would influence soil fertility once life establishes itself there? Planetary/astronomical considerations (day length?) are also fair game. submitted by /u/Kastornak [link] [comments]

Is there any simple explanation in terms of spacetime for why c is invariant in every inertial reference frame? Posted: 29 Aug 2016 03:20 PM PDT I can just about grasp that any such explanation probably invokes spacetime geometry and length contraction, but I can't seem to think of an explanation for either length contraction or invariant c. I also have an inkling that a non-invariant c would require a universal fixed reference frame, and we can't have that. I would happily consider speculative explanations, btw. submitted by /u/consciousrealism [link] [comments]

How can something be redox inactive? Posted: 30 Aug 2016 01:51 AM PDT Hello, I understand that redox reactions involve the transfer of electrons and a change in oxidation state. But how can something like Zn2+ be redox inactive? Thank you! submitted by /u/bucketfullofcats [link] [comments]

How do they keep radiation from contaminating the water which evaporates out of the top Nuclear Power Plants? Posted: 29 Aug 2016 09:19 PM PDT Okay, so in Water Moderated Reactors, I understand that they use rods to contain the radioactive materials (usually Uranium-235), and because of the nuclear reactions these rods get really hot and they use the water to cool them down which is where all the water vapor comes from. (Please correct me if I'm wrong about any of this) So what confuses me is how do the keep the radiation inside of the rods? If it contaminated the evaporating water wouldn't that result in toxic rain? And because we know this is bad and don't want it to happen I have to believe that we've done something to prevent it. I know lead blocks all sorts of radiation but lead contamination would be almost as bad as fallout. So how do we do it? submitted by /u/zthompson2350 [link] [comments]

When I use a nail clippers and cut a little chunk of skin off the end of my thumb, what am I cutting? Is it skin? Posted: 29 Aug 2016 01:22 PM PDT Why is it see-trough and why doesn't it hurt when normally breaking skin would? submitted by /u/Shentai- [link] [comments]

Why is it possible to recover data from a drive after a zero-fill? Posted: 29 Aug 2016 11:27 PM PDT I've read from multiple sources that writing zeros on the whole drive once is not enough to guarantee that the data will not be recoverable, how come? submitted by /u/KingKunter [link] [comments]

Does Heisenberg's Uncertainty Principle imply that we will never need to determine the position of an electron? Posted: 29 Aug 2016 11:07 PM PDT . submitted by /u/seablaster1999 [link] [comments]

With people that have brown/blue eyes, is their a difference between nighttime vison? Posted: 29 Aug 2016 10:40 PM PDT In scientific fact, lighter colors reflect light while darker colors absorbed it. With night vision, shouldn't darker eyes be able to see better because of this if so/not explain? Thank you =) submitted by /u/trollteemo [link] [comments]

What issues would be be worried about if we were experiencing global cooling, instead of global warming? Posted: 29 Aug 2016 09:56 AM PDT With global warming, there are many interesting consequences that I never would have considered. What would these be if the planet was cooling? submitted by /u/greysplash [link] [comments]

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Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

What's going on when I'm getting a "kink in my neck" after sleeping in an odd position?

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• What's going on when I'm getting a "kink in my neck" after sleeping in an odd position?
• On Saturday Juno flew to within 4,200km of Jupiter... but within 4,200 km of WHAT exactly?
• Do computer simulations involving physics have to account for wave-particle duality? Has it posed an issue before?
• How big would proxima B look from the planets surface?
• In 1899 "Mile-a-Minute" Charles Murphy set a bicycle world record of 60 mph by riding behind a train to reduce drag, would this approach work for human runners as well to break the elusive 30 mph threshold?
• Are Supermassive Blackholes eating galaxies orbiting them?
• Do different ethnicities have a better/worse chance of contracting certain diseases?
• If I were to go back in time with modern day smartphone, how far would I be able to go back and still get coverage?
• Is there such thing as hybridization involving the f orbital?
• Does refractive index vary with thin film thickness?
• how big would a telescope need to be to image the disk of proxima centauri b?
• Why is computer data actually "moved" when I move a file to a different folder? Why not use an index instead?
• Do males display symptoms from STDs/STIs differently than females?
• Why do panic attacks cause disorientation?
• Is there a way to use electromagnetism or another force to act on non ferrous metals or other materials?
• Since Potassium is a Alkali Metal, then how does our bodies use it in reactions effectively? What is preventing K+ from reacting with an undesired compound such as water?
• Why do tradition ICE cars benefit from multiple gears and EVs do not?
• Why does the ampersand symbol (&) sometimes incorrectly display as &?
• Can the body remove foreign objects lodged in the flesh on its own? If so, why does this sometimes not happen?
• How can a spinning T-handle sometime accelerate?
• With the current state of astronomy, what is the minimum likely warning of an Earth-asteroid impact with something similar in size to the Chicxulub impactor, which was roughly 10 km in diameter?
• What happens to neutron stars, pulsars, and other super dense objects after they've spent their energy? Can their material be reabsorbed into new stars, solar systems, or galaxies?
• How do GPS satellites cope with the millions of vehicles requesting their locations at once?
• What is the best voting system to decide where to eat with a group of friends?

What's going on when I'm getting a "kink in my neck" after sleeping in an odd position? Posted: 28 Aug 2016 08:59 AM PDT I must have slept weird but I woke up with a kink in my neck. What happens that causes this? submitted by /u/Tredronerath [link] [comments]

On Saturday Juno flew to within 4,200km of Jupiter... but within 4,200 km of WHAT exactly? Posted: 28 Aug 2016 07:07 PM PDT When NASA says Juno flew within 4,200km of Jupiter, what are they measuring from? Another way to ask is: Juno approached within 4200km of WHAT exactly? My understanding is that Jupiter's atmosphere gradually transitions to liquid, with no solid "surface" - so it can't be the surface of the planet. I also assume that the edge of the atmosphere is fairly fuzzy between Jupiter and space - there is no solid line where the atmosphere "ends." submitted by /u/groovybrent [link] [comments]

Do computer simulations involving physics have to account for wave-particle duality? Has it posed an issue before? Posted: 29 Aug 2016 06:56 AM PDT submitted by /u/MemesMemesMemesMemes [link] [comments]

How big would proxima B look from the planets surface? Posted: 29 Aug 2016 07:19 AM PDT In relation how much more sky would be covered with the "orb" of sunlight? As in, would it look similar to our own sun's size, would it be brighter or dimmer , larger or smaller (due to the size and distance from planet surface) ? submitted by /u/Razzreal [link] [comments]

In 1899 "Mile-a-Minute" Charles Murphy set a bicycle world record of 60 mph by riding behind a train to reduce drag, would this approach work for human runners as well to break the elusive 30 mph threshold? Posted: 29 Aug 2016 07:15 AM PDT submitted by /u/onajag [link] [comments]

Are Supermassive Blackholes eating galaxies orbiting them? Posted: 29 Aug 2016 08:11 AM PDT submitted by /u/rohanrz [link] [comments]

Do different ethnicities have a better/worse chance of contracting certain diseases? Posted: 28 Aug 2016 04:11 PM PDT submitted by /u/wayne060012 [link] [comments]

If I were to go back in time with modern day smartphone, how far would I be able to go back and still get coverage? Posted: 28 Aug 2016 07:47 PM PDT Modern day smartphone as in an Iphone 6s or Galaxy s7 submitted by /u/PapaGregori [link] [comments]

Is there such thing as hybridization involving the f orbital? Posted: 28 Aug 2016 06:09 PM PDT Also, in molecular orbital theory diagrams, how come I never see d or f orbitals mixing to form the bonding and anti-bonding molecular orbitals? submitted by /u/Calaminh [link] [comments]

Does refractive index vary with thin film thickness? Posted: 28 Aug 2016 08:58 PM PDT I plotted the refractive index as a function of wavelength for AZO thin films (deposited by magnetron sputtering) of varying thicknesses (46.5nm, 92.5nm, 271.5nm, 501.1nm, 827.1nm) and observed that the refractive index changes slightly with thickness. Shouldn't the refractive index remain a constant for all thicknesses of the same material at a particular wavelength? submitted by /u/Callmecruel [link] [comments]

how big would a telescope need to be to image the disk of proxima centauri b? Posted: 29 Aug 2016 08:22 AM PDT I figure really really big. submitted by /u/aggasalk [link] [comments]

Why is computer data actually "moved" when I move a file to a different folder? Why not use an index instead? Posted: 28 Aug 2016 05:40 PM PDT I just moved some videos on my phone to a new folder (also on my phone). It took several minutes to complete the move. If we used an index instead, the files wouldn't have to be moved, and "moving" files would take no time at all. There must be other reasons for actually re-writing the data to the same drive, so I'm wondering what those might be. submitted by /u/lespritdelescalier11 [link] [comments]

Do males display symptoms from STDs/STIs differently than females? Posted: 28 Aug 2016 09:36 PM PDT My SO and I slept together for the first time, and to make sure, she got tested. She came back positive for one, and advised me to get checked as well. She said her doctor said the same, saying something along the lines of males typically take a long time to display symptoms of an STI, if at all. Any truth? submitted by /u/ryguy28896 [link] [comments]

Why do panic attacks cause disorientation? Posted: 28 Aug 2016 03:16 PM PDT So I've suffered panic attacks for over a decade and I'm kind of used to them but recently noticed there is one effect of panic that I don't understand the physiological basis for. When I get a panic attack or am under extreme stress, I get a strange delirious feeling like my proprioception is getting confused - for instance, it may feel like my head is floating above my body, or sometimes it feels like my arms are where my legs are and my legs are where my arms are, or sometimes it feels like I have no torso. It is like my mind 'forgets' where my body parts are and my internal model of them gets jumbled up. This stops, of course, if I look down at my body or touch something almost to 'remind' my brain where my body parts are, but if there is no reference point, they get mixed up and I get a bizarre feeling of disorientation. I assume this isn't actually useful in a crisis situation and is more of a byproduct of fight/flight? How does adrenaline work to cause disorientation of this kind? EDIT: I just double checked to make sure I had used the word proprioception correctly....still not sure I have...but while doing so discovered there has been some kind of link made between vestibular/proprioception difficulty and agoraphobia. If anyone can explain that link that would be really interesting - I have agoraphobia and also have a history of inner ear problems leading to perforated eardrums, difficulty balancing, and the habit of falling over if there isn't enough of a light source for me to orientate myself to (i.e. I think I over-use vision for balance) - all of which I had assumed was down to my history of ear problems. How the hell do these things link to agoraphobia? submitted by /u/reallybigleg [link] [comments]

Is there a way to use electromagnetism or another force to act on non ferrous metals or other materials? Posted: 28 Aug 2016 06:26 PM PDT Like the title says, is there a way to apply a force to metals other than iron, nickel, and cobalt using a magnetic or electric field? If so, is there a way to make the field "selective" as in it applies to only one type of material? A hypothetical situation would be multiple types of metal mixed together on a conveyor. As each metal passes through its respective field it would either be attracted or repelled from the other materials to remove it from the mix. My thought process is using some form of frequency or other variance to cause only one material to react similar to how different filters act on the different colors of light due to wavelength . I'm not even sure if it's possible, just something that's been rolling around in my head enough to make me curious. submitted by /u/jrragsda [link] [comments]

Since Potassium is a Alkali Metal, then how does our bodies use it in reactions effectively? What is preventing K+ from reacting with an undesired compound such as water? Posted: 28 Aug 2016 06:01 PM PDT I've noticed that a lot of times that Potassium ions are used to perform reactions with the body such as muscle movement in animals or opening and closing of the stomata in plants. For humans it is absorbed through ingestion and for plants, the roots; both of these are aqueous environments, something that potassium is regarded to be highly reactive to since it is an Alkali Metal. Is there a type of transport protein that aids in the movement or perhaps because it is an ion that it is able to be controlled, or is it an entirely different answer all together? I would like to hear your thoughts. Regards, A Confused High School Student submitted by /u/RelentlessRetort [link] [comments]

Why do tradition ICE cars benefit from multiple gears and EVs do not? Posted: 29 Aug 2016 05:34 AM PDT Hello, I've been trying to look this up online and haven't been finding much, so I'll expand on my question. When looking at any available EV that I know of (leaf, tesla, bmw i3, etc) none of them have any kind of gear system for higher speeds. I drive a 2013 Nissan Altima for example and its most efficient speed seems to be between 65-70 mph (with a CVT transmission). A tesla's most efficient speed is around 45 mph. Why wouldn't giving it a second gear around 45 mph make it more efficient at a higher speed? The only thing I can think of is that electric motors have very little friction to make higher RPMs worse and that as you increase the RPMs on an ICE engine you get a proportional increase in piston firings, burning more fuel. Is there anything else to it? Why wouldn't giving a tesla a second gear more mileage at higher speeds? Do electric cars lose mileage at higher speeds mostly from greater wind resistance? I'm asking because range for EVs is one of the biggest problems right now, and if a tesla model S gets 465 miles to a charge at 45 mph, wouldn't a second gear drastically increase the 265 mile range at 70mph? submitted by /u/Skylake1987 [link] [comments]

Why does the ampersand symbol (&) sometimes incorrectly display as &? Posted: 28 Aug 2016 04:27 PM PDT submitted by /u/-LizardWizard- [link] [comments]

Can the body remove foreign objects lodged in the flesh on its own? If so, why does this sometimes not happen? Posted: 28 Aug 2016 09:31 PM PDT For example, a piece of pencil graphite or a splinter that stays in you for a number of years. submitted by /u/CFAggie [link] [comments]

How can a spinning T-handle sometime accelerate? Posted: 29 Aug 2016 05:00 AM PDT The second attempt (not the first or third) made in this video by an astronaut to spin a T-handle in zero gravity results in what appears to be an increasing linear acceleration. There appears to be a slight wobble syncing up with the flips of the T-handle but isn't it forbidden to have acceleration in this scenario? Is it an initial push slowly being released? Something else? submitted by /u/AlohaItsASnackbar [link] [comments]

With the current state of astronomy, what is the minimum likely warning of an Earth-asteroid impact with something similar in size to the Chicxulub impactor, which was roughly 10 km in diameter? Posted: 28 Aug 2016 12:36 PM PDT I would assume that the likely worst case scenario would be on a very long period, highly elliptic orbit, that is roughly on the same plane as everything else in the solar system. submitted by /u/Smalmart [link] [comments]

What happens to neutron stars, pulsars, and other super dense objects after they've spent their energy? Can their material be reabsorbed into new stars, solar systems, or galaxies? Posted: 28 Aug 2016 09:23 AM PDT Considering how dense objects like neutron stars are, what happens to them after they die? Are they broken apart, exploded, absorbed into new objects, or something else? submitted by /u/cteavin [link] [comments]

How do GPS satellites cope with the millions of vehicles requesting their locations at once? Posted: 28 Aug 2016 11:24 AM PDT I presume there are loads of GPS satellites that triangulate the position of vehicles with satnavs etc. but are there computers onboard these satellites and how do they relay all that information at once to the right vehicle? submitted by /u/CappucinoCake [link] [comments]

What is the best voting system to decide where to eat with a group of friends? Posted: 28 Aug 2016 09:39 AM PDT Me and some friends meet up regularly for eating and trying out different restaurants. It's a lot of fun, but lately we've been finding it difficult to find a suitable compromise to satisfy everyones tastes. That got me thinking about consensus in small groups like ours and ultimately lead to my question: If we were voting on where to eat next, how should the voting process (or system) look like? I'm not very familiar with the field, and so far the best I've found is Instant-runoff voting. I'm still wondering if there might be a better one among the ones listed on wikipedia that I've failed to recognize. submitted by /u/raffomania [link] [comments]

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