What's the point of retroviruses having a reverse transcriptase to turn RNA into DNA instead of simply having DNA?

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• What's the point of retroviruses having a reverse transcriptase to turn RNA into DNA instead of simply having DNA?
• When I use a counterfeit Apple charger on my iPhone it says "not supported" and won't charge. Can my iPhone actually block the power it's receiving from the charging cord? How does it do it?
• If I had a mixture of oil and water in a container, is it possible to calculate the time it takes for the two to separate?
• Is it possible to get a different combination of quarks than uud or udd? Do there have to be three quarks or could you have a combination of, say, two or four? Why/why not?
• Why do some vaccines wear off over time?
• If I am made from star dust, how many stars do I come from?
• When you cut solid matter in half, why can't you recombine it?
• Does Ionizing radiation cause other diseases besides cancer?
• Why does metal feel colder than the ambient temperature?
• Why does soap lower surface tension?
• Is it possible for Earth to be hit by massive gravitational waves? If so, what would happen?
• Why isn't HPV vaccine recommended for adults past a certain age?
• What exactly happens between the alpha particles and the air to cause clouds to form in a cloud chamber?
• Why can I write a two-electron wavefunction as a product of two wavefunctions?
• Why do cellular networks have consistently strong connections with cell phones despite towers being miles away and yet Bluetooth or WiFi signals have such difficulty maintaining consistent connections with the same phone even though they are mere meters away?
• How does the collision of two protons resulting in a Hydrogen-2 atom release energy if neutrons are more massive than protons?
• When you heat something up it glows. Where do those emitted photons come from?
• If Earth had it's trajectory changed by some gravitational force would the Moon continue orbiting Earth?
• Whys is sound quality over the phone still much worse than a sound recording taken on the same phone?
• How does a car calculate its average speed?
• How does the energy required to enrich fissile material compare to the energy released in reactors and bombs?
• What determines the size of the strings in string theory?

What's the point of retroviruses having a reverse transcriptase to turn RNA into DNA instead of simply having DNA? Posted: 30 Oct 2017 12:25 PM PDT Wouldn't it be simpler for retroviruses to have a DNA (like other types of viruses for example)instead of generating DNA from RNA trough an enzyme? What's the evolutionary advantage of having such mechanism? submitted by /u/iron14 [link] [comments]

When I use a counterfeit Apple charger on my iPhone it says "not supported" and won't charge. Can my iPhone actually block the power it's receiving from the charging cord? How does it do it? Posted: 30 Oct 2017 04:56 PM PDT So let me explain myself. My understanding is that when I plug my cellphone charging, energy is "traveling" from the electrical outlet to my phone. Apple created all these software locks to avoid people from getting counterfeit chargers; however, can a software block the physical phenomenon of charging a cellphone? submitted by /u/LiterallySagan [link] [comments]

If I had a mixture of oil and water in a container, is it possible to calculate the time it takes for the two to separate? Posted: 30 Oct 2017 12:20 PM PDT If I had a mixture of oil and water in a container, is it possible to calculate the time it takes for the two to separate? Thanks! submitted by /u/mikemavz [link] [comments]

Is it possible to get a different combination of quarks than uud or udd? Do there have to be three quarks or could you have a combination of, say, two or four? Why/why not? Posted: 31 Oct 2017 01:58 AM PDT submitted by /u/EldestPort [link] [comments]

Why do some vaccines wear off over time? Posted: 31 Oct 2017 04:27 AM PDT submitted by /u/Give_Me_A_Cheque [link] [comments]

If I am made from star dust, how many stars do I come from? Posted: 31 Oct 2017 05:53 AM PDT submitted by /u/user366 [link] [comments]

When you cut solid matter in half, why can't you recombine it? Posted: 30 Oct 2017 08:07 PM PDT For instance, If you cut a sheet of paper in half with scissors, what occurs in order for the sheet to become two distinct sheets that cannot recombine? Is there a way to recombine the paper without adhesive material? submitted by /u/shirefriendship [link] [comments]

Does Ionizing radiation cause other diseases besides cancer? Posted: 31 Oct 2017 12:58 AM PDT If ionizing radiation causes cancer by damaging DNA and by causing genetic mutations why does it not cause other diseases that are caused by genetic mutations and DNA damage. I was wondering this because a former coworker recently finished radiation therapy of the brain. submitted by /u/Redrobin45 [link] [comments]

Why does metal feel colder than the ambient temperature? Posted: 30 Oct 2017 11:09 AM PDT submitted by /u/BariumSodiumNa [link] [comments]

Why does soap lower surface tension? Posted: 30 Oct 2017 04:17 PM PDT Just curious, I understand that soap is basic in general but how does that or other properties of soaps cause lower surface tension? submitted by /u/djh816 [link] [comments]

Is it possible for Earth to be hit by massive gravitational waves? If so, what would happen? Posted: 31 Oct 2017 05:46 AM PDT I've been seening stuff lately about scientists having detected gravitational waves from merging black holes. Is it possible for one of these waves to slam into Earth? And what would happen if it did? submitted by /u/Voliminal92 [link] [comments]

Why isn't HPV vaccine recommended for adults past a certain age? Posted: 30 Oct 2017 07:57 PM PDT I was recently looking over the CDC recommended immunization schedule for adults and I noticed a couple of oddities. Most notably is the HPV vaccine. Why isn't this recommended for males past age 21 and for females past age 26? Is there a biological reason that people become less susceptible as they age? On a related note, why is 1957 the cutoff birth year for MMR vaccine? submitted by /u/EroPero [link] [comments]

What exactly happens between the alpha particles and the air to cause clouds to form in a cloud chamber? Posted: 30 Oct 2017 03:55 PM PDT I understand the basic premise of a cloud chamber - the air is supersaturated, so even the tiny alpha particles are enough to cause the clouds to form. But how exactly are the alpha particles interacting with the air? If they are travelling in straight lines, it makes it seem like they just passing through without interacting with anything. Any clarification or deeper understanding of this neat phenomena will be greatly appreciated! :) submitted by /u/CypressBreeze [link] [comments]

Why can I write a two-electron wavefunction as a product of two wavefunctions? Posted: 30 Oct 2017 05:53 PM PDT If I have one electron |a> and another |b>, it seems that writing the two-particle wavefunction |tp> as |tp>=|a>|b> would give me zero everywhere if the particles were far apart. Can someone tell me, or guide me, to what I'm missing? I have a feeling it's straightforward and I'm just slow but I can't figure it out. submitted by /u/your_pyness [link] [comments]

Why do cellular networks have consistently strong connections with cell phones despite towers being miles away and yet Bluetooth or WiFi signals have such difficulty maintaining consistent connections with the same phone even though they are mere meters away? Posted: 30 Oct 2017 10:50 PM PDT submitted by /u/batmanshome [link] [comments]

How does the collision of two protons resulting in a Hydrogen-2 atom release energy if neutrons are more massive than protons? Posted: 30 Oct 2017 08:22 PM PDT I am talking about the first step in the proton-proton change which forms helium out of hydrogen in stars. Before I googled the masses of protons and neutrons, I assumed protons were more massive, so that once two protons turned into a proton and a neutron, the difference in mass would be what is converted to energy. submitted by /u/TheInternetShill [link] [comments]

When you heat something up it glows. Where do those emitted photons come from? Posted: 30 Oct 2017 11:45 PM PDT submitted by /u/davofuzz [link] [comments]

If Earth had it's trajectory changed by some gravitational force would the Moon continue orbiting Earth? Posted: 31 Oct 2017 05:18 AM PDT submitted by /u/MiopeCiclope [link] [comments]

Whys is sound quality over the phone still much worse than a sound recording taken on the same phone? Posted: 31 Oct 2017 03:34 AM PDT With modern technology and incredibly crisp sound recording available at your fingertips, why do phone calls still sound bad? submitted by /u/ANotoriouslyMeanBean [link] [comments]

How does a car calculate its average speed? Posted: 31 Oct 2017 03:28 AM PDT I know how an average is calculated with a fixed amount of numbers. But speed is constantly changing and keeping track of all the different speeds looks like an impossible task. How do they do it? submitted by /u/DoNotLookAtMyUsernam [link] [comments]

How does the energy required to enrich fissile material compare to the energy released in reactors and bombs? Posted: 30 Oct 2017 10:35 AM PDT During WW2 the Clinton Engineer Works in Oak Ridge, TN were "consuming one-seventh of all the power being produced in the nation." (pdf page 21) That seems like a lot(!) of energy, especially spread over months. I'm curious what the energy in / energy out balance actually was both for bombs and for reactors today. The fat man and little boy yielded 151 TJ of energy. Do we know how much energy it took to make them? Do we have a similar calculation for modern reactors? submitted by /u/bunabhucan [link] [comments]

What determines the size of the strings in string theory? Posted: 30 Oct 2017 05:19 PM PDT We know that in this theory the strings are super miniscule. What defines their size? Can't the theory work with those strings be 1000 times bigger? submitted by /u/hectofun [link] [comments]

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What makes a food 'filling'? Is it just calories?

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• What makes a food 'filling'? Is it just calories?
• Does the universe have a center of mass?
• Are there things in genetics that can skew the general 50/50 nature of having a boy or girl?
• Do you have to take into account atmospheric pressure when calculating the upward acceleration of rockets?
• Is there a way to know where did the asteroid A/2017 U1 came from?
• If the windchill is below freezing but the actual temperature is above freezing, will water freeze?
• Why is it that oil has a very noticeable change in viscosity at different temperatures, but water does not?
• Is it possible for two suns to exist in a solar system?
• How did we figure out the mass of elementary particles?
• What is difference between Photon in terms of quantum of light and Electromagnetic force carrier?
• Don't plasma drifts due to curvature and gravity mean that tokamaks are inherently flawed?
• Why do cosmic X-ray sources appear to be more isotropic than the microwave background radiation?
• How are the leaves of touch sensitive plants, i.e. Venus fly traps and the shame plant actuated? How do they sense that there is something on them without nerves?
• how can condensation occur INSIDE a sealed plastic bag?
• What kind of effect would the gravitational waves generated by GW170817 have on surrounding star systems (aside from the massive release of electromagnetic energy)?
• Is "a coma" a blanket term for multiple conditions?
• Why is it possible for photons to have exactly the right frequency to cause an electron transition in atoms?
• Are we sure that SI units are sufficient?
• How can I separate gold mixed with iron ?
• How do we know anyons exist if they only occur in two dimensional systems?
• If you have a dimmable lightbulb and always turned it to partial brightness, would it last longer than a lightbulb always turned to full brightness?
• Dark matter has mass and is effected by gravity. Does this mean that dark matter coalesces into planet and star-like masses?

What makes a food 'filling'? Is it just calories? Posted: 29 Oct 2017 06:48 PM PDT submitted by /u/dandidin [link] [comments]

Does the universe have a center of mass? Posted: 29 Oct 2017 04:25 PM PDT submitted by /u/EXTRAVAGANT_COMMENT [link] [comments]

Are there things in genetics that can skew the general 50/50 nature of having a boy or girl? Posted: 30 Oct 2017 06:13 AM PDT We have a running joke in our family that "we only make boys". My father was one of 8 brothers. he himself had 3 sons (2 different marriages) his middle son has 2 sons (again 2 different partners) and is expecting a 3rd son in the next few months. nobody else in our family has kids yet.... now based on the fact we are taught all the way through schools that the boy girl chance is about 50/50, that makes the chance of my family's male child run of 14 children in the region of 1/16400... i.e pretty unlikely Obviously we could just be incredibly Lucky/Unlucky (delete as appropriate) but i'm curious to know if there is anything that makes people more predisposed to creating male or female offspring? submitted by /u/devlifedotnet [link] [comments]

Do you have to take into account atmospheric pressure when calculating the upward acceleration of rockets? Posted: 30 Oct 2017 04:45 AM PDT Hi, If yes, do you have to apply the force of gravity and the force of atmospheric pressure separately? submitted by /u/Szesan [link] [comments]

Is there a way to know where did the asteroid A/2017 U1 came from? Posted: 30 Oct 2017 05:45 AM PDT The trajectory of the asteroid A/2017 U1 has been already calculated/estimated from observations, so we know now which direction it came from, I think I have read somewhere that it came approximately from the direction of Vega. However its approximation speed to the solar system (26 km/s) means it would have taken 300,000 years to make the travel, what may locate Vega and all near stars from a totally different positions, not to mention further stars. submitted by /u/jambreunion [link] [comments]

If the windchill is below freezing but the actual temperature is above freezing, will water freeze? Posted: 30 Oct 2017 03:20 AM PDT submitted by /u/meatyleash [link] [comments]

Why is it that oil has a very noticeable change in viscosity at different temperatures, but water does not? Posted: 29 Oct 2017 08:17 PM PDT submitted by /u/jellbogen [link] [comments]

Is it possible for two suns to exist in a solar system? Posted: 30 Oct 2017 05:01 AM PDT Is it possible to have two suns, next to eachother, with planets rotating around them, as one solar system? How would that work, and how would it affect the planets? submitted by /u/elosociu [link] [comments]

How did we figure out the mass of elementary particles? Posted: 29 Oct 2017 02:56 PM PDT Have always we figured out the mass of such small particles. submitted by /u/SyntheticPanthera [link] [comments]

What is difference between Photon in terms of quantum of light and Electromagnetic force carrier? Posted: 30 Oct 2017 07:10 AM PDT It says it all, i don't seem to find an answer, if photon is referred to both what is different? submitted by /u/SoDifferentDude [link] [comments]

Don't plasma drifts due to curvature and gravity mean that tokamaks are inherently flawed? Posted: 30 Oct 2017 01:00 AM PDT It's what it sounds like. Charged particles traveling in a curved path have a curvature drift, which results in the particle having... ... a slow drift which is perpendicular to both the local direction of the magnetic field and the direction to the local centre of curvature of the field. i.e. up or down. Along with the myriad other drifts that charged particles undergo, one is due to an external force - in this case, drift due to gravity. This could cause a drift in a couple different directions, depending on which magnetic field you look at. Tokamaks will have both of these drifts present, and both drifts serve to drive charged particles into the wall of the reactor, which immediately causes them to lose any potential of fusion. Therefor, tokamaks are doomed to fail before they ever get the chance. Hence, Stellarator. This is stuff I learned in an introductory plasma physics course. If it's such basic knowledge, and seemingly inescapable for toroidal approaches to fusion, why are world-class physicists still chasing tokamaks, like ITER? Is there a secret that I just don't know about? submitted by /u/rockitman12 [link] [comments]

Why do cosmic X-ray sources appear to be more isotropic than the microwave background radiation? Posted: 29 Oct 2017 04:09 PM PDT This image is composed of two distinct pictures of the Milky Way: the left one on X-ray wavelengths, the right one on the microwaves. Shouldn't X-ray sources appear more localized, at least compared to the CMB radiation map? submitted by /u/TheGreatDaiamid [link] [comments]

How are the leaves of touch sensitive plants, i.e. Venus fly traps and the shame plant actuated? How do they sense that there is something on them without nerves? Posted: 29 Oct 2017 05:56 PM PDT submitted by /u/angrybeaver200 [link] [comments]

how can condensation occur INSIDE a sealed plastic bag? Posted: 30 Oct 2017 05:38 AM PDT So i have a sealed bag of jelly (each with their own individual plastic packaging). I placed this in a cooler box with ice. And when i took it out, there was water INSIDE the plastic packaging. I don't understand where this water came from (no holes in the plastic bag). I think it's condensation but does that not require humid air. Temperature that day was pretty hot so there is humid air AROUND the plastic packaging, but would the air inside the packaging itself (why would that be humid) be able to cause condensation from the jelly? submitted by /u/hapyapolsors [link] [comments]

What kind of effect would the gravitational waves generated by GW170817 have on surrounding star systems (aside from the massive release of electromagnetic energy)? Posted: 30 Oct 2017 01:24 AM PDT submitted by /u/Ycarusbog [link] [comments]

Is "a coma" a blanket term for multiple conditions? Posted: 29 Oct 2017 04:10 PM PDT submitted by /u/Skrtmvsterr [link] [comments]

Why is it possible for photons to have exactly the right frequency to cause an electron transition in atoms? Posted: 29 Oct 2017 10:58 AM PDT As far as I understand the energy levels of electron orbitals in atoms are strictly quantised. So it takes x amount of energy for an electron to move from n=1, to n=2. So to make this transition the atom can absorb a photon of energy E=x=hf. The possible energy spectrum of photons is continuous (?), so to me it seems like the probability of any photon having an energy of exactly x should be zero. Given this, the probability of a photon being able to cause a transition should also be zero. What part of my reasoning is wrong? submitted by /u/PencilRiddenYarn [link] [comments]

Are we sure that SI units are sufficient? Posted: 30 Oct 2017 02:58 AM PDT For example, in the past, people can know and measure quantities like time, mass, length. And it was sufficient, but they didnt know about electricity or didnt know how to measure temperature. Today we know. But is it possible in the future we will have to "invent" new quantity/ies because SI units wont be sufficient? Some quantities we even dont consider today? submitted by /u/sadam23 [link] [comments]

How can I separate gold mixed with iron ? Posted: 30 Oct 2017 06:22 AM PDT I think title says it and also sorry for bad english submitted by /u/blackman9977 [link] [comments]

How do we know anyons exist if they only occur in two dimensional systems? Posted: 30 Oct 2017 02:32 AM PDT How would we ever be able to prove that anyons exist? Is it possible to create our own two dimensional system? submitted by /u/ringbear9000 [link] [comments]

If you have a dimmable lightbulb and always turned it to partial brightness, would it last longer than a lightbulb always turned to full brightness? Posted: 29 Oct 2017 10:23 AM PDT submitted by /u/Laytheron [link] [comments]

Dark matter has mass and is effected by gravity. Does this mean that dark matter coalesces into planet and star-like masses? Posted: 29 Oct 2017 10:35 AM PDT If that is the case it blows my mind that there is matter like this in the universe and we have no way of directly observing it. Would a normal matter object fall straight through a planet-like mass made of dark matter? submitted by /u/yoshi8710 [link] [comments]

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[chemistry] Why does Cl- not form Cl2 in water?

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• [chemistry] Why does Cl- not form Cl2 in water?
• Why are all electrons the same mass, as well as protons and neutrons?
• 3 Earthquakes near the north pole today, is there a fault that extends through that area? Why would a 5.7, 5.7 & 6.0 all occur in the same location?
• What is the farthest direct parallax measurement of an object?
• Do cosmic rays have any effect on modern computing software/hardware?
• How are we able to flex each digit of the hand individually when the flexor digitorum is one muscle that has attachments to the 4 digits?
• Can we hope to either stumble upon an organism that feeds of radiation or create one?
• Is it possible to prove the existance of the inflaton field by detecting an "inflaton particle"?
• When you get cancer, is most of the pain focused on the area that you have cancer in? Or does the pain spread out across the body regardless of the origin of cancer?
• Why does turning a PC off then on again often fix the problem?
• Why are Venus and Uranus the only planets in the solar system that rotate clockwise?
• In terms of the mechanism of action of aspartame, why is it 200x sweeter than sugar?
• What is the smallest amount of blood that can be analyzed in a medical blood lab?
• What type of software would be needed to simulate an asteroid impact, and the resulting weather and climate impact because of the modeled impact?
• Why can your brain simulate sensory sensations during a dream but not while awake and day dreaming?
• Are any other animals able to interpret differences in human facial expression?
• Does earth's center of gravity shift as the topography changes (mountains, tides)? Does the core move?
• Is there a science behind Origami, or do different shapes get discovered simply by trial and error?
• Can an opening in an electromagnetic wave reflector that is smaller than the wave, pass it through?
• Why do Domesticated Cats like to run in front of your legs when you're walking? What behavior is this demonstrating?
• How do we know what is in the center of the Earth?

[chemistry] Why does Cl- not form Cl2 in water? Posted: 29 Oct 2017 06:15 AM PDT I work in water treatment but I'm not a chemist. I'm seriously considering further education because the more I learn the more I want to know. I use drop-test kits and a typical water sample can contain 30ppm Cl- (chloride) , 0.3ppm ClO- (free chlorine) and 0.4ppm Cl2 (total chlorine) What stops the Cl- from becoming Cl2? Why does my total chlorine test kit not pick up the chloride? What would have to change in order to make the Cl- form covalent bonds and become Cl2? What are some good sources of information on water chemistry? submitted by /u/Ken-_-Adams [link] [comments]

Why are all electrons the same mass, as well as protons and neutrons? Posted: 29 Oct 2017 06:46 AM PDT I've been wondering this for awhile now and haven't quite found an explanation for it, how is it that all of these particles are universally the same no matter where you measure it? submitted by /u/pjcandleanaiii [link] [comments]

3 Earthquakes near the north pole today, is there a fault that extends through that area? Why would a 5.7, 5.7 & 6.0 all occur in the same location? Posted: 28 Oct 2017 10:13 PM PDT 5.7 North of Franz Josef Land 2017-10-28 16:13:54 (UTC) 10.0km 5.7 North of Franz Josef Land 2017-10-28 16:16:07 (UTC) 10.0km 6.0 North of Franz Josef Land 2017-10-28 19:11:01 (UTC) 10.0km submitted by /u/MasterOfNotAThing [link] [comments]

What is the farthest direct parallax measurement of an object? Posted: 29 Oct 2017 03:17 AM PDT I haven't been able to find any clear reporting on the Gaia mission, even though it was supposed to be able to directly measure a lot farther than before. submitted by /u/AStatesRightToWhat [link] [comments]

Do cosmic rays have any effect on modern computing software/hardware? Posted: 29 Oct 2017 12:13 AM PDT I've been learning about how many hardware components rely on precise quantum mechanical interactions to work properly, and just wondered if extra solar EM waves have any measurable impact on modern hardware/software technology? I would imagine if a high energy gamma ray were to somehow find its way into a computer, it could cause some mayhem, but didn't know if it was a documented phenomenon. Thanks in advance! submitted by /u/throwaway3141598 [link] [comments]

How are we able to flex each digit of the hand individually when the flexor digitorum is one muscle that has attachments to the 4 digits? Posted: 28 Oct 2017 08:14 AM PDT submitted by /u/mlladas [link] [comments]

Can we hope to either stumble upon an organism that feeds of radiation or create one? Posted: 28 Oct 2017 09:13 AM PDT I was reading a comic book earlier today called 'Low'(really good read) and near the end as humans set foot on earths surface (they had gone into the depths after catastrophic radioactive warfare) for the first time in thousands of years they encounter and entirely different ecosystem. An ecosystem that has evolved not just to feed off radiation but to use it in self-defense. I've read the concept before but I never really thought of it in terms of feasibility. submitted by /u/Vic_KE [link] [comments]

Is it possible to prove the existance of the inflaton field by detecting an "inflaton particle"? Posted: 29 Oct 2017 05:57 AM PDT I've heard that the inflaton is supposed to be a scalar field, just like the higgs field; so I was wondering, would it be possible to prove it's existence by detecting an "inflaton particle"? Does such a particle even exist? submitted by /u/iron14 [link] [comments]

When you get cancer, is most of the pain focused on the area that you have cancer in? Or does the pain spread out across the body regardless of the origin of cancer? Posted: 28 Oct 2017 05:36 PM PDT I understand that the pain is, in general, throughout the body. However, is it "more" painful in the specific area that the cancer originated? For example, would colon cancer have more pain in the colon area than the rest of the body? submitted by /u/theroyalham [link] [comments]

Why does turning a PC off then on again often fix the problem? Posted: 29 Oct 2017 03:17 AM PDT submitted by /u/kickittome1 [link] [comments]

Why are Venus and Uranus the only planets in the solar system that rotate clockwise? Posted: 28 Oct 2017 12:18 PM PDT submitted by /u/mac_2099 [link] [comments]

In terms of the mechanism of action of aspartame, why is it 200x sweeter than sugar? Posted: 28 Oct 2017 09:17 AM PDT submitted by /u/21stCenturyDelphox [link] [comments]

What is the smallest amount of blood that can be analyzed in a medical blood lab? Posted: 28 Oct 2017 05:45 PM PDT Follow up question: Is a small portable version of a a blood lab possible ? submitted by /u/Communistbourgeois [link] [comments]

What type of software would be needed to simulate an asteroid impact, and the resulting weather and climate impact because of the modeled impact? Posted: 29 Oct 2017 03:28 AM PDT My knowledge of this is very layman's level. I'm writing a screenplay on this and I want to be as on point as I can. The most I've been able to find from google is Impact Earth, Crater Impact, and not much more than these types. But I want to be able to be much more specific, like what temperature the area my characters who are a few hundred to a few thousand miles away are going to be experiencing. What type of timeframe would it be? Will it be -90 or just below freezing, or would that part of the earth even freeze and it be nbd? How long would it take, and how long would it last for the different locations that the characters will be? those types of questions are beyond my abilities to answer. submitted by /u/rreighe2 [link] [comments]

Why can your brain simulate sensory sensations during a dream but not while awake and day dreaming? Posted: 28 Oct 2017 09:04 AM PDT For example, a kissing sensation feels real while asleep and dreaming but not daydreaming. submitted by /u/Piddling [link] [comments]

Are any other animals able to interpret differences in human facial expression? Posted: 28 Oct 2017 05:45 PM PDT For example, are there any predators that would understand a human snarling with teeth bared, similar to what many other animals do? submitted by /u/15MinuteUpload [link] [comments]

Does earth's center of gravity shift as the topography changes (mountains, tides)? Does the core move? Posted: 28 Oct 2017 02:54 PM PDT submitted by /u/KuntaStillSingle [link] [comments]

Is there a science behind Origami, or do different shapes get discovered simply by trial and error? Posted: 28 Oct 2017 08:05 AM PDT submitted by /u/NeokratosRed [link] [comments]

Can an opening in an electromagnetic wave reflector that is smaller than the wave, pass it through? Posted: 29 Oct 2017 12:20 AM PDT We did an experiment in class where we covered our phones in tin foil and tried to call each other. And our teacher said that we have to make sure there are no holes in the foil. But how can a really tiny hole pass let through a wave thats up to a meter long? submitted by /u/fucmylife [link] [comments]

Why do Domesticated Cats like to run in front of your legs when you're walking? What behavior is this demonstrating? Posted: 28 Oct 2017 08:31 AM PDT I honestly don't know the answer to this - you'd think the negative feedback of being kicked (accidentally) everyday would eliminate the behavior. submitted by /u/DrBearcut [link] [comments]

How do we know what is in the center of the Earth? Posted: 28 Oct 2017 12:26 PM PDT According to Google, the deepest anyone has ever gone is about ~7 miles below Earth's surface (James Cameron, Challenger Deep submarine)... Earth is 7917 miles in diameter... so the FARTHEST down we have observed, ever, is like 0.194% of the RADIUS of Earth, right? So the other 99+% is not observable by any current means. How do we know what is beneath us, especially at the center? I know we have a magnetosphere that protects us from harmful particles, so that is a clue. What else leads us to "know" anything about the center and mantle? Seems like it would have to be speculation/theory Edit- math was off on the radius percentage... I think that's right now? 0.194? submitted by /u/JOHANSENATOR [link] [comments]

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