Pages

Friday, September 22, 2017

Are there any challenges for parasites living in animal blood?

Are there any challenges for parasites living in animal blood?

Are there any challenges for parasites living in animal blood?

Posted: 21 Sep 2017 05:32 PM PDT

As far as I know, most habitats have qualities that challenge inhabitants, so I was wondering how a blood habitat would challenge a parasite living in it.

submitted by /u/cuckoo22
[link] [comments]

What happens to heavy elements in a star?

Posted: 22 Sep 2017 04:20 AM PDT

I know that stars produce them when they explode, and that's the google result that is hard to dig through for an answer to this, but as the title says; What happens to heavy elements in a star? Do they get ejected, do they coalesce and get pushed aside in the core, or what?

Edit: I should clarify, I looked up heavy elements and apparently that means anything over #92 on the periodic table. I really just meant any metals, like gold as an example because it's relatable.

submitted by /u/TopComms
[link] [comments]

Have we physically measured time dilation in a real time experiment before?

Posted: 21 Sep 2017 11:06 PM PDT

If we put PTSD patients in an fMRI and asked them to relive their triggering memory, what would the scans show and what would it mean? Would it be possible to differentiate experience of the triggering memory from other significant emotional memories?

Posted: 22 Sep 2017 01:52 AM PDT

I understand the clinical side of ptsd but not the neurological side and am interested in finding out more, but don't know where to start or what the basics are. My preexisting knowledge is a B+ worth of Brain and Cognition five years ago in my undergrad. I presume there'd be arousal in the amygdala because it is fear inducing and the temporal lobes because it is a memory but that is guess work. Thank you for your time!

submitted by /u/dry-cleaner
[link] [comments]

Do Fungi have cell walls?

Posted: 22 Sep 2017 05:06 AM PDT

I'm not too sure, but do fungi have cell walls containing chitin?

submitted by /u/DemDankMemes
[link] [comments]

Why are atoms seemingly more stable at the "magic numbers" of 2, 8, 20, and 50?

Posted: 21 Sep 2017 08:29 AM PDT

Is it possible to crack/shatter a quartz (or any piezoelectric material) with enough electricity?

Posted: 21 Sep 2017 11:42 PM PDT

Will it crack, explode, shatter, or just melt when too much voltage is applied?

submitted by /u/NorthboundFox
[link] [comments]

Will cooling a piece of plastic increase its rigidity?

Posted: 21 Sep 2017 11:37 PM PDT

Since getting it hot has the opposite effect (melting), if I stick a piece of plastic in the freezer will this make it more rigid?

submitted by /u/Fluffy_G
[link] [comments]

Can trapped charged particles escape the Van Allen Belts? If so, how?

Posted: 21 Sep 2017 03:36 PM PDT

I teach a general astronomy course at my university. While discussing the Earth's magnetosphere and the Van Allen Belts, a student asked if the radiation was just building up or if a portion of it could escape somehow. I didn't know off the top of my head, so rather than BS an answer, I told them I'd find out and report back. A quick google and wikipedia search hasn't provided me with a succinct answer, so I'm hoping reddit can help me out.

My best guess is that random collisions give random particles enough energy to escape from the belts, but I'm not sure.

submitted by /u/mick4state
[link] [comments]

How far does electricity travel when lightening hits the ocean?

Posted: 21 Sep 2017 10:33 PM PDT

How was the modern science of photosynthesis and respiration discovered?

Posted: 21 Sep 2017 02:11 PM PDT

I'm a second level science teacher and I often get asked when teaching photosynthesis & respiration "how did people discover this?" I can never give a definite answer. I'm aware how it was originally discovered ,but I want to be able to give the answer as to how the electron pathways and things like the Krebs cycle were discovered. Thanks

submitted by /u/thefint
[link] [comments]

Why do bubbles in a glass or cup tend to move to the edges and stay there?

Posted: 21 Sep 2017 09:38 PM PDT

I don't mean carbonation. When I pour a coffee or something, the bubbles are all spread out and then "migrate" to the sides of the cup, even if you slosh it around a little.

submitted by /u/Kansai_Moth
[link] [comments]

What, if anything, are we doing to reduce waste buildup orbiting earth?

Posted: 21 Sep 2017 07:37 PM PDT

From what i know, it will soon become increasingly more difficult to launch spacecraft due to a field of it growing in our orbit. Could we somehow pull or push it into earths atmosphere for it to burn up?

submitted by /u/b-crew96
[link] [comments]

Is a rigid vacuum balloon possible? If so, how buoyant would it be?

Posted: 21 Sep 2017 05:14 PM PDT

How exactly do scents just "disappear"?

Posted: 21 Sep 2017 11:12 PM PDT

How do scents disappear? From what i understand scent is caused by small particles, but as long add those particles exist, shouldn't the smell last forever? For example, if i were to spray perfume into a pillow, i would expect the scent to last indefinitely until i wash it since the particles are still on the pillow.

submitted by /u/iritator
[link] [comments]

If sea level is rising, why are the beaches I know still the same size and shape?

Posted: 21 Sep 2017 10:20 AM PDT

It seems pretty clear that sea level is rising (3mm a year): https://oceanservice.noaa.gov/facts/sealevel.html That being the case, shouldn't that be obvious when looking at beaches and other coastlines? All the coastlines I know well (Northern Europe) haven't noticeably changed in the last 20 years and looking at old photos, haven't changed in over 100.

I could understand the argument that some areas rise while others fall for various reasons but, again, looking at historical photos of other regions, the story is the same.

So why doesn't sea level seem to be rising to a layperson when the actual rise is significant?

submitted by /u/whocaresitsjustred
[link] [comments]

[Astrophysics] Do gravity waves propagate at the speed of light, or, if they are ripples in the fabric of Space-time, do they propagate instantaneously?

Posted: 21 Sep 2017 07:00 PM PDT

Why don't we use Thorium for our power plants?

Posted: 21 Sep 2017 09:57 AM PDT

Is our body better at warming us up or cooling us down?

Posted: 21 Sep 2017 11:24 AM PDT
vào lúc No comments:

Thursday, September 21, 2017

Does heat, humidity, and other atmospheric variables affect wi-fi and other signals?

Does heat, humidity, and other atmospheric variables affect wi-fi and other signals?

Does heat, humidity, and other atmospheric variables affect wi-fi and other signals?

Posted: 20 Sep 2017 07:36 PM PDT

Are there equations that model how rivers change their course over time?

Posted: 21 Sep 2017 05:20 AM PDT

I was looking at this picture, and it reminded me of the Kelvin–Helmholtz instability

How accurate this idea? The KH-instability is only intended for use at the interface between two fluids, and the riverbed is solid. Are there good equations modeling how rivers change their course over time?

submitted by /u/Baconmancr
[link] [comments]

What elastic moduli are strain dependent?

Posted: 21 Sep 2017 06:54 AM PDT

Hi,

I'll try and keep it brief; Which of the elastic moduli show a strong dependence on strain rate and magnitude?

I know for a fact that the shear modulus does, do the bulk and young's modulus also?

Some background to my question - I am working with both dynamic and static moduli at varying measurement frequency, and well aware of shear-modulus degradation with strain. But I was wondering about the others. If anyone can direct some reading my way that would be great; I have access to most journals and papers through my institution.

Thanks

submitted by /u/8556732
[link] [comments]

Where does the Higgs boson gets its own mass?

Posted: 21 Sep 2017 03:11 AM PDT

I was learning about the Higgs boson and read that it had mass but if everything got its mass from the Higgs boson and the Higgs field then how does a Higgs boson get mass? Does it self interact? Or does the Higgs Boson not have mass and can travel at light speed?

submitted by /u/JackTalle
[link] [comments]

What do sexes in fungus mean?

Posted: 20 Sep 2017 12:43 PM PDT

From the Wikipedia entry on Schizophyllum commune

It has 23,328 distinct sexes; individuals of any sex are compatible for mating with all but their own sex.

What does that mean?

submitted by /u/Snewzie
[link] [comments]

Where does the theoretical "two week" limit on weather forecasting skill come from?

Posted: 21 Sep 2017 04:53 AM PDT

I'm familiar with Lorenz' chaos paper and ensemble forecasting in general but I have yet to find a reference that actually calculates the oft repeated "two week" theoretical limit on weather forecasting. Does anyone know of the original reference?

For context, here are the final paragraphs from Ed Lorenz' seminal chaos paper:

This quasi-periodic behavior need not be established, though, even if very-long-range forecasting is feasible, if the variety of possible atmospheric states is so immense that analogues need never occur. It should be noted that these conclusions do not depend upon whether or not the atmosphere is deterministic.

There remains the very important question as to how long is "very-long-range". Our results do not give the answer for the atmosphere; conceivably it could be a few days or a few centuries. In an idealized system, whether it be the simple convective model described here, or a complicated system designed to resemble the atmosphere as closely as possible [Such as weather forecasting models], the answer may be obtained by comparing pairs of numerical solutions having nearly identical initial conditions [Ensemble forecasting]. In the case of the real atmosphere, if all other methods fail, we can wait for an analogue [Cheeky].

submitted by /u/aClimateScientist
[link] [comments]

Do Most Comets Orbit in the Same Plane as the Planets?

Posted: 21 Sep 2017 08:18 AM PDT

How different is our vision from the other apes?

Posted: 21 Sep 2017 08:17 AM PDT

Does honey from different flowers taste different or do all bee "recipes" taste the same?

Posted: 21 Sep 2017 08:12 AM PDT

Similarly, do these differences affect pollen allergy sensitivity?

submitted by /u/shutterlagged
[link] [comments]

Where does the "blast" portion of a nuclear explosion come from?

Posted: 20 Sep 2017 03:04 PM PDT

In a chemical explosion, overpressure is generated by rapidly expanding gasses as the explosive reacts with Oxygen. I can see where the kinetic energy is produced there. In a nuclear explosion, it's a little bit fuzzier as to where the medium is getting the kinetic energy to produce a pressure wave. Is it coming from the expulsion of high-speed neutrons and fission products? Or is the radiation itself producing pressure from thermal expansion?

submitted by /u/Rysander
[link] [comments]

Historically, when large numbers of sailboats/ships had to travel in formation as a fleet, are there different dynamics governing the movement of ships in the front, middle and rear of the group?

Posted: 20 Sep 2017 11:20 AM PDT

I was wondering if large numbers of ships traveling together created issues for the ships behind them. Does wind change direction in between the boats of the fleet? Are there currents created by the front of the fleet that can cause problems for the rest of the fleet? Does that translate to larger ships today, like the ships the navy uses?

submitted by /u/scrubbingbubble
[link] [comments]

How do female mosquitoes know humans have blood to suck?

Posted: 21 Sep 2017 04:42 AM PDT

How do your eyes prevent shaking while you're walking?

Posted: 20 Sep 2017 05:49 PM PDT

I've paid close attention to how some camera's now use OIS, or optical image stabilization, and EIS, or Electronic image stabilization and I was wondering why my vision isn't shaking while I'm walking. Is it some physical thing near my eyes stabilizing what I see or is that handled by the brain?

submitted by /u/wisconsinb5
[link] [comments]

Does a volcanic eruption make another volcanic eruption more likely?

Posted: 20 Sep 2017 01:48 PM PDT

Clarification: Another eruption from a different volcano.

submitted by /u/re_nonsequiturs
[link] [comments]

Saw this strange cloud over Santa Cruz/tenerife today. Everyone was taking pictures. Can someone explain what is going on here? (does this type have a name?...)

Posted: 20 Sep 2017 06:42 PM PDT

Here is a picture. We strolled through the city and everywhere were people taking pictures of it. Clpud https://imgur.com/gallery/09tbN

submitted by /u/farox
[link] [comments]

Do atmospheric CO2 measurements include a significant diurnal cycle?

Posted: 20 Sep 2017 11:58 AM PDT

I know the annual cycle is obvious in CO2 concentrations. Is a diurnal cycle often visible either locally or globally?

Also, what (roughly) is the mixing time scale for CO2 over the whole atmosphere?

submitted by /u/descabezado
[link] [comments]

Are Toucans (Americas) and Hornbills (Asia/Africa) an example of convergent evolution?

Posted: 20 Sep 2017 09:53 AM PDT

Indian Hornbill

Toucan

Both eat fruit/insects in various amounts depending on the species. Figs, etc.

submitted by /u/sobeadrenalinerush
[link] [comments]

How do bionic arms work?

Posted: 20 Sep 2017 10:11 AM PDT

My understanding is people can control bionic arms the same way they control regular arms: through volition and transmitting neurological signals to various locations in the body.

Where and how do bionic arms interface with the body? Do they read neurological signals directly? How?

submitted by /u/_Clever_Name_Here_
[link] [comments]

Why do nuclei release energy when they fuse?

Posted: 20 Sep 2017 11:16 AM PDT

I understand that the binding energy increases, but this doesn't make sense to me.

You need a lot of energy to break a small nucleus into its constituents to overcome the strong force, but why would "submitting" to the strong force and attracting cause energy to be released?

Is this some sort of potential energy? (Like how work is needed to overcome gravity, but if an object "submits" to gravity and falls it releases its potential energy)

Is it the case with all forces that when something submits to a force it releases its potential energy like that?

submitted by /u/Ambidextroid
[link] [comments]

Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science

Posted: 20 Sep 2017 08:07 AM PDT

Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science

Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...".

Asking Questions:

Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions.

The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists.

Answering Questions:

Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience.

If you would like to become a member of the AskScience panel, please refer to the information provided here.

Past AskAnythingWednesday posts can be found here.

Ask away!

submitted by /u/AutoModerator
[link] [comments]

What are the estimated thicknesses for northern sea-ice at the height of the Pleistocene glaciation, and how are those thicknesses estimated?

Posted: 20 Sep 2017 12:48 PM PDT

I get how these estimates are calculated on land, on the basis of isostatic rebound notably. But how do we work that out over sea?

submitted by /u/Gargatua13013
[link] [comments]

Why are non-differentiable continuous functions integrable?

Posted: 20 Sep 2017 09:18 AM PDT

We learnt that a |mod| function is continuous yet non-differentiable and as integrals are defined as "anti-derivatives" sooo how come we can integrate a mod function yet we can't differentiate it?

submitted by /u/Ishjot11
[link] [comments]
vào lúc No comments:

Wednesday, September 20, 2017

Earthquake Megathread

Earthquake Megathread

Earthquake Megathread

Posted: 19 Sep 2017 01:19 PM PDT

Hi everyone!

Unfortunately, there have been recent reports of another earthquake in Mexico, a magntiude 7.1 centered about 100 miles from Mexico City. We had a previous megathread discussing the last earthquake (magnitude 8.1) off the coast less than two weeks ago. If you've got more questions about earthquakes, feel free to ask those here! Panel members will be in and out throughout the day so please do not expect an immediate answer. Again, for hurricane questions, please direct them to our hurricane megathread instead.

Useful links:

submitted by /u/AskScienceModerator
[link] [comments]

If a nuclear bomb went off in Boston harbor could scientists tell after the fact who had manufactured it, do they leave distinct radioactive signatures?

Posted: 19 Sep 2017 11:59 PM PDT

Asking for a friend

submitted by /u/plato1123
[link] [comments]

Do black holes have electromagnetic field?

Posted: 19 Sep 2017 11:44 PM PDT

I read that black holes have three properties mass, spin, and charge. But if they have charge, then thet have an electromagnetic field. But then electromagnetic fields are described that carried by virtual photons. But nothing can leave a black hole event horizon, not even photons. What am I missing?

submitted by /u/gibizer
[link] [comments]

How many layers are there in a modern integrated circuit?

Posted: 20 Sep 2017 12:48 AM PDT

I'm getting how the raster dictates density of elements in IC in the horizontal plane over the wafer. But as I understand, there's the third dimension - so far mostly untapped because of heat dissipation necessity; the bit of wafer in a CPU is a rather flat square, not a cube. Still, if my understanding is correct, there's more than a single layer of the components on the wafer, they are stacked to a degree. How many layers though? And how thick such a layer is?

submitted by /u/sharfpang
[link] [comments]

Do people that have degenerative diseases such as Alzheimer's lose their muscle memory as well?

Posted: 19 Sep 2017 02:34 PM PDT

How is it possible that something as large as a possible Planet 9 has completely evaded visual observation?

Posted: 19 Sep 2017 07:17 PM PDT

I've heard that if there actually is a Planet 9, it's more than 10x the size of Earth. I understand that Planet 9 is extremely far away, but it seems that something that large could not avoid being seen for so long. How can it be that all of Earth's astronomers have missed it for so long?

submitted by /u/lonewanderer44
[link] [comments]

How did they measure hurricane wind speeds in the 1800's?

Posted: 19 Sep 2017 06:12 PM PDT

Saw a post on facebook indicating the history of cat 5 hurricanes, and was curious how they measured wind speed as far back as 1850.

Also, should I cross post this to r/AskHistorians?

submitted by /u/coolscreenname
[link] [comments]

Why does the Earth's rotation effect Rockets and not Planes?

Posted: 20 Sep 2017 06:10 AM PDT

Most rockets are launched into a prograde orbit as it's more efficient to do so with the earth's rotation.

If I were to fly around the equator the planes their relative velocity would just be it's speed because it's already traveling at the speed of the earth's rotation before take off. Not matter what direction due to the reference frame or say a person on the ground both would appear at going the same speed just in alternate directions. (Assuming no other influence the efficiency will be the same).

If I were to launch a rockets at the equator from the same locations into an orbit one with the rotation and one against it why then do we need to think about the earth's rotation for efficiency? Probably something simple but I can't get my head around it, hope you understand what I'm asking. Thanks.

submitted by /u/RandomQuestion567
[link] [comments]

What is happening at a molecular level when a knife cuts through nylon rope?

Posted: 19 Sep 2017 03:14 PM PDT

How is it that scissors can curl ribbons?

Posted: 19 Sep 2017 05:51 PM PDT

Everytime I wrap a gift, I always ended it with the ribbon,on the gift (or box) being curled. I wondered how that happens.

submitted by /u/TheMainEngy
[link] [comments]

Would global cooling create more land? If so, how much more land would be available before the whole earth freezes?

Posted: 19 Sep 2017 10:05 PM PDT

My hypothesis is based on the reverse of the polar ice caps melting. If there was a global cooling, then I imagine the polar ice caps would grow in size (more water freezes) and the ocean level would get lower, baring more land.

submitted by /u/_goodboy
[link] [comments]

Why is caesium the largest atom? Shouldn't element 118 be the largest?

Posted: 19 Sep 2017 01:55 PM PDT

Does my peripheral vision have a different latency than objects I look directly at?

Posted: 19 Sep 2017 04:28 PM PDT

For example. I have a timer counting down from 60. The timer is displayed in two spots on the left and the right. If I watch the timer on the right directly and the timer on my left is in my peripheral vision, do I see the timer on the left update after the timer on the right? Or do I see them update at the same time? Is this a real latency or a perceived latency?

submitted by /u/_Guinness
[link] [comments]

[CHEMISTRY] How do chemical companies determine if one ingredient in a solution can be replaced by another?

Posted: 19 Sep 2017 09:22 AM PDT

If two chemicals aren't the same, how would a company determine if something is a good replacement?

submitted by /u/ClevalandFanSadface
[link] [comments]

Do snakes that can 'see' heat, such as ball pythons, compare their 'heat vision' with their normal vision?

Posted: 19 Sep 2017 06:22 PM PDT

I have a pet ball python, and I've been wondering this for a while.

Basically, do pythons identify, with their normal vision, the source of the heat? The process I am imagining is just like the way humans compare their hearing to their sight, in order to identify the source of the noise.

Am I correct at all, or do they interpret the senses completely differently?

submitted by /u/derekthesnake
[link] [comments]

What defines an equation of state?

Posted: 19 Sep 2017 07:54 PM PDT

I'm taking a thermodynamics course and learning about State Functions and Equations but am confused by some of the finer details. For example I can see online that enthalpy has an equation dH(S,P)= TdS + VdP. Is this considered an equation of state, or are the relations (dH/dS)p=T and (dH/dP)s=T the equations of state? Most publications I can find seem to use equations of state as a stepping stone for Maxwell equation or other derivations and don't spend any time specifically defining what equations of state are.

submitted by /u/Meto1183
[link] [comments]

Can a human be allergic to any substance? As in, does every material have the potential to elicit an allergic response?

Posted: 19 Sep 2017 10:51 AM PDT

Why is gold found in seams?

Posted: 19 Sep 2017 07:35 AM PDT

I know that heavier elements basically form during supernovas, and I think the heaviest element a star like our sun will produce would be iron. So, the gold and all of the other heavy elements explode in an incredible display of violence, across the galaxy. Then we fast forward on to present day, and a bunch of the gold on earth has collected into a "seam". What's the geological process for this? And are we just incredibly lucky to have reasonably significant amounts of most naturally occuring elements?

submitted by /u/Serendiplodocus
[link] [comments]

On an alien planet, would a regular compass still point true north?

Posted: 19 Sep 2017 07:33 AM PDT

On Earth, "magnetic north" (the direction that compasses point) and one of the Earth's axes ("true north") happen to be in approximately the same place. This seams too neat and clean to be a coincidence, so would the same thing happen on an average alien planet with a magnetic field? Are magnetic poles 'drawn' to the axes of a planet, or is that just coincidence?

submitted by /u/sixcubit
[link] [comments]

In emergencies like on CDMX will using cellphone data on a very far state affect the capacity on CDMX cell towers to make calls and/or use cell phone data?

Posted: 19 Sep 2017 08:56 PM PDT

Can someone with reading Aphasia "read" in Braille?

Posted: 19 Sep 2017 08:26 AM PDT

So in class, my psych teacher was explaining how damage to the Angular Gyrus leads to aphasia, specifically Aphasia where you can't read properly. I was wondering if this also extends to and affects Braille.

submitted by /u/Kufu1796
[link] [comments]
vào lúc No comments:
Subscribe to: Posts (Atom)