How do they keep patients alive during heart surgery when they switch out the the heart for the new one?

---

• How do they keep patients alive during heart surgery when they switch out the the heart for the new one?
• What happens to light after it hits the cone or rod cells in our eyes?
• Could Venus have supported life in the distant past?
• Why do we still use/need SIM cards?
• How did people classify molds before the invention of the microscope? Did they classify them as plants, fungi, or something else?
• Is mammal hair a "descendent/divergence" of feathers?
• What is the mechanism that allow dolphins and whales to stay underwater for such a long time?
• Does the distribution of plastic in our oceans help us learn about ocean movements?
• if hot air goes up, why are the top of mountains cold?
• When people experience head trauma, why are they told NOT to sleep?
• What is the difference between the six types of quarks?
• What limits the size of a cell? (in particular I'm interested how long it takes for enzymes/nutrients etc to travel within a cell to a place they need to be)?
• What population impacts were observed from adding iodine to table salt?
• [also engineering] How do roller coasters maintain the same speeds with so many different loads of people?
• How do we know how many stars are in a galaxy?
• How do charge carriers deliver energy to a circuit element, without a change in their kinetic energy?

How do they keep patients alive during heart surgery when they switch out the the heart for the new one? Posted: 08 Jun 2018 09:55 PM PDT submitted by /u/FatAndAnnoying [link] [comments]

What happens to light after it hits the cone or rod cells in our eyes? Posted: 09 Jun 2018 04:59 AM PDT I was wondering if it just someone floats out of the eye, if it's just absorbed, or whatever. If it is absorbed, does that affect the cell itself in anyway? submitted by /u/Smewai [link] [comments]

Could Venus have supported life in the distant past? Posted: 09 Jun 2018 04:31 AM PDT It's roughly the same size as Earth, and by some estimates it's in the Sun's habitable zone. Could it have supported life, and if so, what happened to make it the way it is today? submitted by /u/JamieBGood1 [link] [comments]

Why do we still use/need SIM cards? Posted: 09 Jun 2018 03:25 AM PDT Why do we still need a physical chip to access mobile network instead of an account?/ is it just because it would mean to modify the structure? int that case wouldn't it still be more convenient to emulate SIM cards with through an IC embedded in the phone? submitted by /u/M1573R_W0LF [link] [comments]

How did people classify molds before the invention of the microscope? Did they classify them as plants, fungi, or something else? Posted: 08 Jun 2018 11:04 PM PDT submitted by /u/griftertm [link] [comments]

Is mammal hair a "descendent/divergence" of feathers? Posted: 09 Jun 2018 04:58 AM PDT A strange question I guess. I have been watching a lot of dinosaur documentaries recently (a caveat about the extent of my knowledge), it seems evidence for feathers in dinosaurs is getting pushed back earlier and earlier in the timeline. Is it possible (or even likely) that mammal hair comes from the same source as these early proto-feathers? submitted by /u/tholovar [link] [comments]

What is the mechanism that allow dolphins and whales to stay underwater for such a long time? Posted: 08 Jun 2018 12:28 PM PDT submitted by /u/aWildNacatl [link] [comments]

Does the distribution of plastic in our oceans help us learn about ocean movements? Posted: 08 Jun 2018 12:26 PM PDT Since I'd imagine researchers can't dump things in the ocean to follow en masse, I wondered if the plastic deposits are giving us insight into where things left in certain parts of oceans inevitably end up? submitted by /u/olioli86 [link] [comments]

if hot air goes up, why are the top of mountains cold? Posted: 08 Jun 2018 09:29 AM PDT submitted by /u/yowhun [link] [comments]

When people experience head trauma, why are they told NOT to sleep? Posted: 08 Jun 2018 09:42 AM PDT What does sleeping does to the brain that it's not advisable to sleep after a head trauma? submitted by /u/Fafafee [link] [comments]

What is the difference between the six types of quarks? Posted: 08 Jun 2018 09:00 AM PDT I know that there are 6 different types of quarks (up, down, charm, etc.) But what exactly is the difference between them? How was it determined which combinations make up protons, neutrons, and so on? On a side note, are they small enough to be considered on the Planck scale? By throwing h = E in Einstein's E=mc2, m=2.281 x 10-42kg for something with one quantum of energy, so are quarks small enough to be on that scale? (I'm sure I'm not making much sense, but if you get what I'm trying to ask, I'm curious about it) submitted by /u/duuuhhh98 [link] [comments]

What limits the size of a cell? (in particular I'm interested how long it takes for enzymes/nutrients etc to travel within a cell to a place they need to be)? Posted: 08 Jun 2018 12:40 PM PDT I googled and read this http://www.ivyroses.com/Biology/Cells/What-limits-cell-size.php, but I was under the impression that cell size was limited because the larger they got, the longer it took to send (for lack of a better word) signals or nutrients from one place to another. Is this not a concern? Is it only a secondary concern? Like, if a cell managed to overcome all the issues in the above link, it would then be primarily limited in size because of this issue? Thanks. submitted by /u/Oldkingcole225 [link] [comments]

What population impacts were observed from adding iodine to table salt? Posted: 08 Jun 2018 11:28 AM PDT I found a study referenced in Wikipedia that stated that the wide-scale adoption of iodine into salt resulted in increased IQ among that age cohort. It stated also that: "We also document a large increase in thyroid-related deaths following the countrywide adoption of iodized salt, which affected mostly older individuals in localities with high prevalence of iodine deficiency." I don't have access to the full text. I was curious if there was a proposed causal mechanism for the mortality among older individuals. submitted by /u/MuskieGo [link] [comments]

[also engineering] How do roller coasters maintain the same speeds with so many different loads of people? Posted: 08 Jun 2018 10:44 AM PDT Say you're riding a roller coaster with a group of 100 pound kids on a field trip. Then the next time you ride it it's all 200+ pound adults. How do they keep the coaster from hitting turns or inversions with too much speed? How is there a guarantee that you'll clear an airtime hill if everyone on your ride is heavy? I know that there are brake runs and sometimes launched coasters like Top Thrill Dragster or Kingda Ka will have roll backs, but it seems like there should be a lot more variation than there is. submitted by /u/WargWrestler [link] [comments]

How do we know how many stars are in a galaxy? Posted: 08 Jun 2018 01:22 PM PDT submitted by /u/DaddyEyeSac [link] [comments]

How do charge carriers deliver energy to a circuit element, without a change in their kinetic energy? Posted: 08 Jun 2018 06:31 AM PDT As an amount of charge passes through a circuit element, a drop in potential energy indicates the transfer of electrical energy into the component. It could be converted to heat/light etc. depending on the component. The amount of energy transfer will = drop in potential. I am trying to wrap my head around where the energy actually comes from, given that there is no drop in Kinetic Energy of the charge carriers, since that would cause a differing current density at the output of the component with respect to the input (which is not what happens)? Please help me intuitively see how everything is conserved! submitted by /u/marmiteandeggs [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

When undersea mammals are born, is it a rave for them to surface to breathe?

---

• When undersea mammals are born, is it a rave for them to surface to breathe?
• Do any animals spit? And if there are none, why?
• Is there a limit for how many frames-per-second we can capture or display with cameras or screens?
• How do satellites fall out of orbit?
• When physicists say light has a wave length of, say 400 nm, what do they actually mean?
• Do rainbows make complete circles but we just don’t see them? Or is it just part of a circle?
• Faith Rodgers recently accused R. Kelly of knowingly infecting her with herpes. Is there a way to prove *he* infected her, based on blood (or other) tests?
• why don't companies like intel or amd just make their CPUs bigger with more nodes?
• In an open-channel flow, if the flow is supercritical and it meets a contraction in the channel, why does the water depth increases?
• Aren't all elements radioactive nuclides to some extent?
• In an open primary election, is it better to vote for my preferred candidate from Party A or the 'least evil' from opposition Party B?
• How can smart scales using bioelectrical impedance differentiate water from muscle/fat?
• Can someone describe - at the physical level - how sound waves propagate through air?
• Why does paper turn yellow after some time?
• What do you call the point where a particle breaks apart?
• Can you have a c-shaped copper coil with a magnet on a arm travel through the gap in the circle and still generate electricity?
• Why are negative integer factorials like (-3)! undefined while rational numbers like (-3,5)! are?
• Can someone derive the intermediate axis theorem?
• Have all bosons in a Bose Einstein condensate the same phase?

When undersea mammals are born, is it a rave for them to surface to breathe? Posted: 07 Jun 2018 11:52 PM PDT I'm in the shower and wondering if dolphins and whales are born deep enough under water they will suffocate from lack of oxygen. EDIT: Race, not rave. Don't think things get that crazy for fish. Mobile won't let me update the title. Sorry. submitted by /u/A-E-I-O-U_sometimesY [link] [comments]

Do any animals spit? And if there are none, why? Posted: 08 Jun 2018 07:18 AM PDT EDIT: It would seem I forgot that llamas existed so I have another question. WHY do some animals spit and others don't? submitted by /u/TurnedUpbeat [link] [comments]

Is there a limit for how many frames-per-second we can capture or display with cameras or screens? Posted: 07 Jun 2018 09:29 PM PDT submitted by /u/thespaceman313 [link] [comments]

How do satellites fall out of orbit? Posted: 08 Jun 2018 05:51 AM PDT I've heard of satellites that fall to Earth, and I've wondered how that happens. submitted by /u/Viking_Chicken [link] [comments]

When physicists say light has a wave length of, say 400 nm, what do they actually mean? Posted: 07 Jun 2018 10:01 PM PDT Like what is actually fluctuating across those 400 nm? Is the photon moving up and down through space (ie it's moving in a wavy manner)? Is it causing space to expand/contract (like a sound wave pushes air molecules together/apart)? Is it some attribute of the photon that changes over that distance (brightness or energy levels or something)? This is just one of those bits of physics that seems pretty crucial but that I just can't find a good explanation for. submitted by /u/Andrewcshore315 [link] [comments]

Do rainbows make complete circles but we just don’t see them? Or is it just part of a circle? Posted: 07 Jun 2018 05:06 PM PDT submitted by /u/techytaco [link] [comments]

Faith Rodgers recently accused R. Kelly of knowingly infecting her with herpes. Is there a way to prove *he* infected her, based on blood (or other) tests? Posted: 07 Jun 2018 09:07 PM PDT Assuming you could test both parties, and both were infected; would it be possible to compare the virus from party a to the virus from party b and say one infected the other? Could you show direction of transmission (using number of mutations, maybe)? submitted by /u/Denniosmoore [link] [comments]

why don't companies like intel or amd just make their CPUs bigger with more nodes? Posted: 08 Jun 2018 07:30 AM PDT submitted by /u/guyush [link] [comments]

In an open-channel flow, if the flow is supercritical and it meets a contraction in the channel, why does the water depth increases? Posted: 08 Jun 2018 05:17 AM PDT I mean, shouldn't it decrease as the width of the channel is narrower and therefore the flow will accelerates, increasing its speed, to keep the flow continuous? Does this mean that flow has gained energy? submitted by /u/GrandMagusSPR [link] [comments]

Aren't all elements radioactive nuclides to some extent? Posted: 07 Jun 2018 06:35 PM PDT Sorry if my question is really stupid! submitted by /u/Nachi445 [link] [comments]

In an open primary election, is it better to vote for my preferred candidate from Party A or the 'least evil' from opposition Party B? Posted: 07 Jun 2018 06:00 PM PDT This is a bit multi-diciplanary. Game Theory? Ask Math? submitted by /u/jboeke [link] [comments]

How can smart scales using bioelectrical impedance differentiate water from muscle/fat? Posted: 08 Jun 2018 02:51 AM PDT Since muscle and fat are themselves composed of water too. submitted by /u/daiqo [link] [comments]

Can someone describe - at the physical level - how sound waves propagate through air? Posted: 08 Jun 2018 02:49 AM PDT My knowledge of physics stopped at secondary school (= high school for US readers) 30 years ago. I've always been interested in music and I'm currently reading a book about acoustics. While reading that book it occurred to me that although I take the propagation of sound through air as given I struggle with forming a mental model about how this works at a molecular level. So far what I have is something like ... The molecules in the speaker cone move forward. These molecules push against the molecules in the air immediately in front of the speaker cone moving them forward. As these air molecules move forward they push against the air molecules in front of them. So I get how a compression wave might be generated. But then the molecules in the speaker cone move backwards. So ... how do the molecules in front of the speaker know to move backward? I get that it's an area of low pressure but that just means "fewer molecules" right? So do the molecules in front of the speaker - have they just rebounded off other air molecules or ... you can see I'm getting in a muddle. Is any of this to do with anything bumping into anything or is this all just nonsense? submitted by /u/HashPram [link] [comments]

Why does paper turn yellow after some time? Posted: 08 Jun 2018 02:32 AM PDT Today I came back from a trip and I noticed that a sheet of paper that I left on my PC last week has a yellow, moisty stain. I doubt that it's just dirty, especialy since we all heard a saying about yellow paper, so I wonder if it's a chemical reaction of cellulose and oxygen. Also, does ink have any effect on it? Why is it, that when we buy new printer paper it's fresh white and stays that way for a long time? submitted by /u/Gadongbadabong [link] [comments]

What do you call the point where a particle breaks apart? Posted: 07 Jun 2018 04:46 PM PDT I'm a senior high school student, so a more simplistic explanation if possible would be much appreciated! My chem professor has informed me that compounds can have triple points as long as they do not exceed 'the point where a particle falls apart'. When asked what it falls apart into, I was told 'some kind of gaseous plasma.' I'd assume there would have to be a ridiculously high amount of pressure and an impossibly hot temperature for this to happen. What does this actually mean? Is somebody able to explain this using an example of a simple compound? Thank you very much! submitted by /u/MedicMoth [link] [comments]

Can you have a c-shaped copper coil with a magnet on a arm travel through the gap in the circle and still generate electricity? Posted: 07 Jun 2018 02:41 PM PDT Newb here. Trying to understand if electricity can be produced if the copper coil isn't a closed circle. Any examples would be welcome :) Thanks in advance! submitted by /u/DB-JR [link] [comments]

Why are negative integer factorials like (-3)! undefined while rational numbers like (-3,5)! are? Posted: 07 Jun 2018 09:30 AM PDT submitted by /u/_Volatile_ [link] [comments]

Can someone derive the intermediate axis theorem? Posted: 07 Jun 2018 03:17 PM PDT Hello everyone, I am a future senior in high school and I just finished AP Physics 1. I came across an interesting phenomenon called the intermediate axis theorem. I understand what the intermediate axis theorem is and how it works. However, to me at the moment I see it as a rule without any understanding of it. I do not understand why the intermediate axis does not have the same restoring force that the other two axes have. If someone could maybe derive the theorem and explain it along the way that would be great. I have found this post: https://www.reddit.com/r/askscience/comments/3lf6x8/why_cant_you_spin_a_phone_around_each_axis/cv5scxb/?st=ithibtpr&sh=d1ec8e9f already and the problem is that I am not completely familiar with all of the terms and language they use. Please keep in mind that even though I love physics I am still only in ap physics 1 when you are answering this question. submitted by /u/toomysxs [link] [comments]

Have all bosons in a Bose Einstein condensate the same phase? Posted: 07 Jun 2018 11:22 AM PDT The bosons in a Bose Einstein condensate form a "macroscopic coherent wavefunction". But can the bosons interfere with each other? Or is this question senseless in some sense? submitted by /u/MaoGo [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

Why does a compressed natural gas tank have expiry date on it? Does it mean it's no longer safe to use after the expiry date?

---

• Why does a compressed natural gas tank have expiry date on it? Does it mean it's no longer safe to use after the expiry date?
• How/why does the body “get used to” cold or hot objects after being in contact for a while?
• Chemically, why was the Fat Man more powerful than the Little Boy? (The nuclear bombs dropped on Hiroshima and Nagasaki)
• Does a rainclouds movement and velocity affect its rainfall?
• Where any black holes created immediately after the Big Bang?
• Why does our immune system not detect and fight off the bodies own cancer?
• How come there are no accurate computer models of wetlands?
• If copper has the best thermal conductivity, why are some computer coolers made out of copper and aluminium, and not just copper?
• What is heat?
• Is there coulomb repulsion between neutrons within a nucleus?
• How do contact lenses automatically slide to your iris/pupil?
• Are we sweating while swimming?
• Do nuclear weapons expire?
• How were special relativity and quantum mechanics conflicting before quantum field theory, and what does QFT do to resolve them?
• How does the human body react to tattoos?
• Physicists or physical chemists: what is a surface plasmon?
• Why is download speed faster than upload speed?
• How does scratching the skin remove the itchy feeling?
• How do you contain tokamak energy when it is hotter than the sun?
• Can a superfluid be compressed?
• Why does Enceladus have geysers made of water and ice spewing from its surface whereas Europa does not? Is there any known reason which explains this notable discrepancy between these two moons?
• Do gas giants really have a surface?

Why does a compressed natural gas tank have expiry date on it? Does it mean it's no longer safe to use after the expiry date? Posted: 06 Jun 2018 11:07 PM PDT I live in a country where I could use compressed natural gas (CNG) as my vehicle fuel instead of petroleum. So I have a CNG tank installed in my boot 9 years ago. The CNG tank's expiry date is reaching soon, I should definitely go for inspection, but does the expiry date means anything at all? I already Google the question, but the top results don't really provide any information about what happens when the CNG tank "expired". submitted by /u/SleepingAran [link] [comments]

How/why does the body “get used to” cold or hot objects after being in contact for a while? Posted: 06 Jun 2018 09:22 PM PDT Is it that the body moves the temperature to the bodies temperature? Or does that body actually get used to it? Is it the skin touching the object 'numbing', or is it a mental change? Thanks! submitted by /u/mapdumbo [link] [comments]

Chemically, why was the Fat Man more powerful than the Little Boy? (The nuclear bombs dropped on Hiroshima and Nagasaki) Posted: 07 Jun 2018 08:09 AM PDT submitted by /u/ironhide1516 [link] [comments]

Does a rainclouds movement and velocity affect its rainfall? Posted: 07 Jun 2018 06:02 AM PDT submitted by /u/Ixula [link] [comments]

Where any black holes created immediately after the Big Bang? Posted: 06 Jun 2018 09:43 PM PDT Edit subject: "Were" - not "Where"... Could it be possible all of the supermassive black holes at the center of today's galaxies are remnants of the Big Bang? Also could it be possible that there was not a single point in the cosmos that started it all but instead each supermassive black hole played a part in the inflation of the universe? Is it possible all of the supermassive black holes in the early Universe were able to eat the inflation of matter and space but the big bang in fact was the turning point where all of these supermassive black holes could no longer consume SpaceTime fast enough? submitted by /u/burner70 [link] [comments]

Why does our immune system not detect and fight off the bodies own cancer? Posted: 06 Jun 2018 10:42 PM PDT submitted by /u/Rueben1000 [link] [comments]

How come there are no accurate computer models of wetlands? Posted: 07 Jun 2018 05:19 AM PDT We have good models for weather, crops, e.t.c. it just seems to me that science is lacking, especially for an ecosystem that provides many benefits. submitted by /u/Kickstand8604 [link] [comments]

If copper has the best thermal conductivity, why are some computer coolers made out of copper and aluminium, and not just copper? Posted: 07 Jun 2018 08:35 AM PDT submitted by /u/lepantella [link] [comments]

What is heat? Posted: 07 Jun 2018 08:21 AM PDT submitted by /u/Huwe [link] [comments]

Is there coulomb repulsion between neutrons within a nucleus? Posted: 07 Jun 2018 07:15 AM PDT Neutrons are of course electrically neutral. But since neutrons are constituted of 2 Down and 1 Up quark, both having fractional electric charges, is there any coulomb interaction between two neutrons that are very close to each other (like in a nucleus)? I would imagine that there should be something like charge displacement within the neutrons due to the presence of the charged quarks of the other nuclei (induced eletrical dipole like with Van-der-Waals interaction). On the other hand I'm pretty sure the strong interaction in this regime is so much stronger that this coulomb interaction is neglectable. Are the charges of the quarks even meaningfully localized within the neutron or is it like a homogeneous state where there's not even the possibility of having a charge displacement? submitted by /u/Ernst37 [link] [comments]

How do contact lenses automatically slide to your iris/pupil? Posted: 06 Jun 2018 07:25 PM PDT submitted by /u/yeetburger [link] [comments]

Are we sweating while swimming? Posted: 06 Jun 2018 03:57 PM PDT Or does the body get cooled enough from the water, so that we don't have to sweat? submitted by /u/zlft [link] [comments]

Do nuclear weapons expire? Posted: 06 Jun 2018 10:08 PM PDT I would certainly hope so, considering there's really no ethical way of disposing them. submitted by /u/Chenaniganz [link] [comments]

How were special relativity and quantum mechanics conflicting before quantum field theory, and what does QFT do to resolve them? Posted: 06 Jun 2018 10:20 PM PDT submitted by /u/Yoochan_Shin [link] [comments]

How does the human body react to tattoos? Posted: 06 Jun 2018 05:35 PM PDT I mean, i know that tattoos are made with some sort of incision and the ink is sort of injected into a layer of the skin, but why doesnt the body fight the ink with antibodies or something, and if it does, why doesnt the body erase the ink or at least reject it? submitted by /u/DrOpe99 [link] [comments]

Physicists or physical chemists: what is a surface plasmon? Posted: 06 Jun 2018 08:26 PM PDT An undergrad researcher here doing work with gold nanoparticles. In solution they are a dark red color, with the hue depending on the diameter of the spheres. The only explanation I have found so far is "surface plasmon resonance" saying that a plasmon is a collective oscillation of the electron sea - what does this mean and how does it correlate to the surface of the sphere and the color of solution? submitted by /u/hilinia [link] [comments]

Why is download speed faster than upload speed? Posted: 06 Jun 2018 06:07 PM PDT I recently did a speed test for my internet, and I was wondering why there is such a large difference between upload speeds and download speeds. submitted by /u/tubazz [link] [comments]

How does scratching the skin remove the itchy feeling? Posted: 06 Jun 2018 05:28 PM PDT Why do we even feel the need to itch? submitted by /u/wgroenning [link] [comments]

How do you contain tokamak energy when it is hotter than the sun? Posted: 07 Jun 2018 03:02 AM PDT So recently a fusion reactor achieved temperature hotter than the sun. How do you contain this without it melting everything around it? I understand magnetism has something to do with it, which makes sense because nothing is touching but doesn't heat still radiate outwards? Or does the magnetism prevent the radiation spreading which means you can stand next to something millions of degrees and not feel the heat? submitted by /u/ScepticalProphet [link] [comments]

Can a superfluid be compressed? Posted: 06 Jun 2018 05:48 PM PDT submitted by /u/marapun [link] [comments]

Why does Enceladus have geysers made of water and ice spewing from its surface whereas Europa does not? Is there any known reason which explains this notable discrepancy between these two moons? Posted: 06 Jun 2018 10:12 AM PDT Both moons are believed to have their own global oceans underneath their icy crusts and scientists reckon that these oceans exist due to gravitational tugging from their parent planets. Why does one of these two moons have jets of water and ice while the other one does not? submitted by /u/Will_Hack_4_Food [link] [comments]

Do gas giants really have a surface? Posted: 07 Jun 2018 02:17 AM PDT submitted by /u/SAIKRISHNA2000 [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States