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Sunday, September 26, 2021

What were the theories about the nature of stars before we began to understand nuclear reactions?

What were the theories about the nature of stars before we began to understand nuclear reactions?

What were the theories about the nature of stars before we began to understand nuclear reactions?

Posted: 25 Sep 2021 12:12 PM PDT

What is the scientific consensus about the polygraph (lie detector)?

Posted: 25 Sep 2021 06:25 PM PDT

I got a new employment where they sent me to a polygraph test in order to continue with the process, I was fine and got the job but keep wondering if that is scientifically accurate, or even if it is legal, I'm not in the US btw.

submitted by /u/JPa258
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Are Neutrinos not faster than light?

Posted: 26 Sep 2021 03:35 AM PDT

Scientists keep proving that neutrinos do not travel faster than the speed of light. Well if that is the case, in case of a cosmic event like a supernova, why do neutrinos reach us before light does? What is obstructing light from getting to us the same time?

submitted by /u/Alberto_Cavelli
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Do we need inflation?

Posted: 26 Sep 2021 05:41 AM PDT

In my understanding, inflation has only negative sideffects, mostly in terms of understandability of the economy. Sure in the old times with gold standard it might have been unavoidable, but nowadays, is there any good in keeping it?

submitted by /u/sachsenschnitzel
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What makes a gene dominant or recessive?

Posted: 26 Sep 2021 01:13 AM PDT

What is the difference between a dominant or recessive gene? I know that dominant genes prevail over recessive ones and this is also the stuff I find on the internet. But I can't find an explanation of what makes a specific gene prevail over other ones in the fist place.

submitted by /u/Maru_Amoriani
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What is the truth behind the threat of "skipping off the atmosphere?"

Posted: 25 Sep 2021 04:22 PM PDT

In space movies, when the brave astronauts are about to re-enter, you often hear someone very solemnly pronounce, "If the angle of re-entry is too shallow, the capsule will skip off the atmosphere." Back on Earth, the astronauts' families cringe in fear, with the implication that this terrible thing must never happen.

What is the reality of this? Have any of our spacecraft actually "skipped off the atmosphere?" If you did "skip off the atmosphere," where exactly would you go? Is this something that could be harnessed productively, like to provide lift or change course? Or is it just some movie metaphor?

submitted by /u/rdhight
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How does the number of chromosomes change upon species differentiation?

Posted: 26 Sep 2021 12:49 AM PDT

I would like to know how the change in the number of chromosomes as an species evolves can be explained against the idea of "irreducible complexity", and what evolutionary advantage it brings to justify it being incorporated into the genome of the entire species.

Bonus question: do species always evolve to have more chromosomes, or does the number sometimes reduce?

submitted by /u/jinjinatti
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What are the applications from understanding the behavior of superionic water?

Posted: 26 Sep 2021 07:32 AM PDT

What factors make the Amazon river so absurdly large compared to every other river on Earth?

Posted: 25 Sep 2021 07:31 PM PDT

I should note when I say large, I don't mean long, I'm talking about water volume that the Amazon discharges every day. Apparently its average discharge is 209,000 cubic metres per second, which makes it bigger than the next 7 largest rivers by discharge combined! I find that quite amazing and I'm wondering what factors play into this, I would assume that the latitude in the world's rainforest belt is important, but the Amazon is still a lot bigger than the Congo in the same latitude.

Does the shape of South America help? It does seem quite unique in having very tall mountains on the far side of the continent with rivers flowing for thousands of kilometres straight to the Atlantic picking more water from massive tributaries along the way, and in the slightly circular shape of northern South America which sort of looks like it could funnel these rivers into the singular gigantic river you see in the Amazon.

submitted by /u/Khwarezm
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How can we tell how far away a star is or how old it is?

Posted: 26 Sep 2021 12:56 AM PDT

Does seminal fluid volume contribute to fertility?

Posted: 26 Sep 2021 03:07 AM PDT

To add detail to the question, if two men have identical counts, will the man with the higher seminal fluid volume have a higher chance of getting a woman pregnant?

On a sub question to this, does length contribute to pregnancy?

My thoughts are that a man has a shorter than average length, with a lower than average fluid output, and with a normal count is less likely to get a woman pregnant than a man with a longer length, higher fluid output, and a normal count.

My reasoning behind my hypothesis is a longer length will get closer to the cervix and the more fluid released will help the sperm get to an egg.

I don't have a complete understanding of the factors at play with male fertility, I wouldn't find it unreasonable if someone said it was only the sperm count that contributed to male fertility vs all the other potential factors.

submitted by /u/jackjack212212212
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Why is sea foam white?

Posted: 25 Sep 2021 08:26 PM PDT

I'm not talking about long-lived foam here, just the foam that forms in breaking waves and disappears almost immediately. I can't find a particular name for ordinary sea foam.

Anyway, near me the ocean is green, or bluey-green but the foam is so very white. Why is it so white?

submitted by /u/k-h
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What is the relevance/real-life application of knowing the specific heat capacity and density of liquids?

Posted: 26 Sep 2021 02:16 AM PDT

Most of the real-life applications of specific heat include those of solids or metals and water, but what about the other liquids? How is knowing their specific heat capacity benefitting us? Do they have a real-life application??

submitted by /u/Chucky_Chanther
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How deep do you have to dig to reach stone?

Posted: 25 Sep 2021 01:13 PM PDT

My son has recently started minecraft, and he usually asks me questions about the game that I try to tie back to the real world. Recently, he asked me how deep he would have to dig in the real world to reach the equivalent of "cobblestone" and "bedrock", but I can't seem to find a clear answer online. Anyone willing to help?

submitted by /u/dndposting
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Is it true that babies only see in black and white until they’re 3 months old? If yes, can someone explain why?

Posted: 25 Sep 2021 09:12 AM PDT

How does latent Tuberculosis work?

Posted: 25 Sep 2021 08:58 AM PDT

Is it true that many people who have latent TB never develop the disease? Why are some people able to completely remove it from their body? And some just make it latent?

submitted by /u/defenseisunderrated
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Have we been able to take an image of an atom? If so, how does it work since they’re too small to catch light?

Posted: 24 Sep 2021 06:34 PM PDT

Why is wind chill only defined for temperatures at or below 50°F and wind speeds above 3 mph?

Posted: 24 Sep 2021 07:14 PM PDT

Do temperatures above 50F not experience a significant drop due to wind chill? What are the mechanics behind this cutoff point?

submitted by /u/Darth_Monkey
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Are there any living organisms that can change the DNA of other organisms?

Posted: 24 Sep 2021 07:06 PM PDT

You'll often see this in science fiction or horror, where an animal will bite/cut/wound/etc another, which will change their DNA and cause wacky things like superpowers (Spider-Man) or turn them into monsters (Prometheus). Obviously it wouldn't be this extreme, but is there any precedent of organisms changing the DNA of other organisms in real life?

(Retroviruses can insert themselves into the genome of their host, but they're not really alive so I don't know if I'd count that)

submitted by /u/tommaniacal
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Saturday, September 25, 2021

Can anything in the universe travel faster than the speed of light?

Can anything in the universe travel faster than the speed of light?

Can anything in the universe travel faster than the speed of light?

Posted: 24 Sep 2021 03:49 PM PDT

It might be a dumb question but is it possible?

submitted by /u/GoAwayBaitinn
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Why the exhaust gas of a rocket engine (or a jet engine) flows faster when the cross section area of the exhaust nozzle increases?

Posted: 25 Sep 2021 05:10 AM PDT

So I was doing some personal study on thrust, and while reading about the convergent-divergent nozzle of a rocket engine, I read that when exhaust gas exiting the combustion chamber reaches Mach 1, the exhaust gas becomes compressible, and the velocity of compressible fluid (in this case the >Mach 1 exhaust gas) is directly proportional to the cross section area of the nozzle.

When we talk about the flow rate of a non-compressible fluid body through an pipe, we acknowledge that the velocity of the non-compressible fluid increases when the cross section area of the pipe decreases.

So why, when a fluid turns from non-compressible to compressible, the rule of flow rate changes to the velocity of the compressible fluid increases when the cross section area of the pipe increases?

What makes compressible fluid different than non-compressible fluid for such change in the rule of flow rate to happen?

submitted by /u/TheBoyWithAName
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What powers a virus' "injection" mechanism?

Posted: 24 Sep 2021 07:14 PM PDT

I am not sure all viruses inject into the cell but i believe some make contact with the surface of a cell and then somehow move the contents of the virus (i guess the viral DNA) into the host cell.

If that is correct, it would take some energy to effect this injection -- I would guess that the virus is "spring loaded" -- there is no actual engine or need to generate energy as a human cell does. But if it is indeed sort of a spring, then two questions: how it the spring released and then how did the tension in the spring get created initially?

submitted by /u/TombStoneFaro
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Is anesthesia medication universal for animals and humans?

Posted: 24 Sep 2021 06:36 AM PDT

There was a video of a Macaw waking up from anesthesia and I'm curious if the medication is universal. Do humans an animals use the same anesthetic medications? Are they derived from the same compounds?

EDIT: Thank you everyone. This is very interesting to read through. 🤯 It's amazing how far we've come.

submitted by /u/slooksterpsv
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What engineering improvements allowed the LTE standard to support higher data download rates when compared to 3G technologies such as HSPA & CMDA2000?

Posted: 24 Sep 2021 02:01 PM PDT

Hello AskScience community! I am an ordinary consumer who recently took notice of the truly staggering improvements seen in the field of wireless data networking over the past 2 decades. Simply put, when I effortlessly play high quality YouTube videos on my phone with no issues, it truly feels like the engineering community is practicing black magic. I'd like to learn about how the RF engineering discipline was able to accomplish these improvements in a bit more technical detail. With that in mind, my question is as follows: what specific engineering improvements (signal processing techniques, electronic hardware on the user terminal side or the RAN/base-station, backhaul, or core network ) allowed for LTE to have higher download speeds than comparable "3G" technologies, such as CDMA2000 and HSPA?

I've tried to keep this question as specific as possible, but I do want to note that the same question could be posed of the various "3G' technologies relative to their "2G" predecessors (GSM, CDMA) and that what I'm interesting in understanding is the full evolution of mobile technologies in at least a non-cursory level of detail. Resources would be welcomed!

Additionally, a sub-question that is of particular interest to me is about the interplay between hardware and signal processing techniques in generating improvements in data rates that I am asking about. Specifically, one of the key reasons that I have seen noted for the increase in data throughput in moving from 3G technologies to "4G" technologies is simply moving the channel to higher frequencies, where there is more bandwidth to play with. But this raises the question - why didn't the (very smart) engineers who were designing 3G technologies like CDMA2000 and HSPA design those technologies to work at the same higher frequencies? It could of course be that operating at those frequencies was not possible until new techniques - which weren't conceived of prior to the ~2005-07 period when LTE hit its stride in development - were developed. But I suspect that at least part of the reason has to do with the fact that electronics improved in some fashion to allow cost-feasible construction of RF circuits that can operate at such frequencies. But perhaps I am wrong!

Would greatly appreciate (relatively) technical answers to either the broader question of why LTE is faster than comparable 3G technologies and/or the more specific one about improvements in electronics!

submitted by /u/to_change
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How can we be sure that radiocarbon dating is accurate?

Posted: 24 Sep 2021 11:00 AM PDT

I recently read this article:

https://www.smithsonianmag.com/science-nature/carbon-dating-crucial-scientific-technique-jeopardy-thanks-our-pollution-heres-easy-way-fix-it-180961345/

It talks about how radiocarbon dating works and why our burning of fossil fuels is sort of throwing a wrench in the process. Which got me thinking, how can we be sure that it was accurate in the first place?

To be sure I'm understanding the process correctly, let me give my rudimentary concept of it. So, the ratio of carbon-14 to carbon-12 isotopes in the environment is pretty stable. The whole time a plant or animal is alive, it's taking in carbon-14 and carbon-12 through breathing, eating, photosynthesis, etc. After the living thing dies, it stops taking in carbon. So the carbon-14, being more reactive starts to break down at a known rate, while the carbon-12 remains. We can look at the ratio of the two isotopes to get an idea of how long a living thing has been dead. Correct?

The problem this article points out is that by burning fossil fuels (which were once those living things), we are releasing tons more carbon-12 into the environment than was there previously, messing up the starting ratio.

My question is: why are we so sure about the ratio of carbon-14 to carbon-12 in the environment in ancient times? Is it possible that compared to 10,000 or a million years ago, there is already far more carbon-12 in the environment? Is it possible that when the earth was a baby planet, the environment was made up of almost entirely carbon-14? Would that screw up the estimates?

Thanks!

submitted by /u/Human-Carpet-6905
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Why noncompressible fluid has higher velocity when moving through smaller cross section area?

Posted: 24 Sep 2021 09:16 AM PDT

Mass flow rate states that cross section area is inversely proportional to fluid velocity in a closed pipe when fluid density is constant.

Therefore, how did a body of fluid gain extra energy to increase its velocity when moving through a smaller cross section area? Did I miss something here?

submitted by /u/TheBoyWithAName
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How does the rapid covid test kit work?

Posted: 24 Sep 2021 09:00 AM PDT

From the look of it, I think it's paper chromatography?

Also, what solution (or what kind of solution) is in the buffer?

How can we explain the result that shows 1 line for the target (usually marked by "T") but doesn't show anything for the control ("C"), even though the buffer solution is already added to the sample? What about the result which shows no lines at all?

Thanks for your input!

submitted by /u/wisenerd
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Are there other acidic pools like the ones in Yellowstone?

Posted: 23 Sep 2021 07:26 PM PDT

I read that someone dissolved in one of Yellowstone's acidic pools and it made me wonder if there are others in the world and what conditions cause them to exist? My searches only lead to articles about Yellowstone.

submitted by /u/parksandthrones
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Dumb question: Do space vehicles have self destruct buttons?

Posted: 23 Sep 2021 05:44 PM PDT

We're watching Aliens. We suddenly realize the apparent absurdity of a self destruct system, yet it's a common trope in movies. Do space vehicles actually have self destruction processes?

Thanks for wasting time with me

submitted by /u/Leggeaux
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Friday, September 24, 2021

Why haven't we selected for Avocados with smaller stones?

Why haven't we selected for Avocados with smaller stones?

Why haven't we selected for Avocados with smaller stones?

Posted: 23 Sep 2021 04:42 PM PDT

For many other fruits and vegetables, farmers have selectively bred varieties with increasingly smaller seeds. But commercially available avocados still have huge stones that take up a large proportion of the mass of the fruit. Why?

submitted by /u/Chlorophilia
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You can get "yellow" either by having monochromatic light at ~590 nm, or by combining red and green light. Why do these two physically different types of light both end up looking the same?

Posted: 24 Sep 2021 06:56 AM PDT

Mixing different frequencies of light doesn't create a new monochromatic light, it's a superposition of all of the individual frequencies. So how is it that combining RGB colors produces the same colors that you can get by varying the frequency of light?

submitted by /u/jugglesme
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Have the symptoms of normal colds and flu become more severe under lockdown? Is there a level of 'generic immunity' which we can lose over time?

Posted: 24 Sep 2021 12:30 AM PDT

The question comes from an entirely anecdotal place, but that was hands down the worst cold I've ever had. And that was with three negative tests, including a PCR.

Is there anything within existing medical knowledge which might support or explain this? Colds evolve constantly and new strains always circulate, but does going longer between infections ironically cause the body to become even more vulnerable to them?

submitted by /u/ChaosKeeshond
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How do scientists know when a species is extinct?

Posted: 24 Sep 2021 04:56 AM PDT

What happened to H1N1 virus that caused the swine flu pandemic of 2009?

Posted: 23 Sep 2021 04:28 PM PDT

Does it still exist? Why is it no longer a pandemic?

Will the same happen to covid-19?

submitted by /u/grasshoppereartquake
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We all know it's dangerous to drink alcohol during pregnancy, but is it more dangerous to drink alcohol during earlier stages of pregnancy, or later stages?

Posted: 23 Sep 2021 02:18 PM PDT

Let's say there are three women. Woman A is 10 weeks pregnant, Woman B is 20 weeks pregnant, and Woman C is 30 weeks pregnant. Let's also assume that each woman is 140 lbs and shares similar physical traits (outside of them each being in different stages of pregnancy). Finally, if it's even relevant here, let's assume they each share the same level of alcohol tolerance (unless the stage of one's pregnancy directly affects how one's body processes alcohol).

Now let's say for some reason they all decide to get drunk every night for a week straight after not having drank alcohol during their pregnancies so far. They each drink a whole bottle of wine each night (which according to this BAC chart would equate to about .16 BAC for a 140 lb person, assuming they each drink the whole bottle in one hour).

This scenario is full of assumptions, and obviously drinking any amount of alcohol at any point during pregnancy is a dangerous, terrible idea. But in this scenario, would one of the three women likely have inflicted more damage on their baby than the other two? Or would the effects likely be the same for each woman's baby, regardless of what stage of pregnancy each woman is in?

edit: corrected estimated BAC

submitted by /u/Hipp013
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Where are antibodies produced in the body and is there a relationship between specific cells and vaccine type?

Posted: 23 Sep 2021 09:58 PM PDT

I was just wondering with my recent Pfizer jab: do mRNA vaccines replicate in the area around the injection site? Or is there some cell specificity? Or is the site of antibody production just the local cells (muscle cells)?

Then in contrast, do viral vectored vaccines (e.g., Astrazeneca) have to circulate to specific cell types to use for antibody replication?

Thanks

submitted by /u/Sassafras_albidum
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How does the new "whitest paint ever" actually work? (How do selective thermal emitters work)

Posted: 23 Sep 2021 10:15 AM PDT

There's a lot of news currently about this new paint that simultaneously can reflect sunlight and emit infrared out into space, so it's able to cool down below ambient temperatures and maybe help with cooling down buildings and stuff.

This generally seems to make sense, but what I don't understand is how a material can selectively emit thermal radiation. As I understand it, thermal radiation is caused by the random jostling of the particles in the material so it is broad-spectrum. How can this paint emit its heat as radiation but only in certain frequencies?

Does this mean that the atoms in the paint can only jostle with specific energies somehow?

Edit: some additional clarity. The paint's IR emissivity is selective, meaning it mostly emits IR from 8-13 μm wavelength. I want to know why these frequencies are selected for, and specifically what is emitting them. Electrons jumping in their orbitals? something about the motion of the atoms or molecules?

submitted by /u/Strange_Magics
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How was dementia treated in the early to mid 1900s?

Posted: 23 Sep 2021 02:14 PM PDT

Do more tropical systems in a season affect winter weather on land? Do more hurricanes in the Gulf of Mexico lead to colder water temps and colder weather on land? Hurricanes feed off of the warm water and rains cold water back down while also blocking the sun temporarily.

Posted: 23 Sep 2021 08:43 AM PDT

My Grandfather, who was a South Georgia farmer, used to say that the more hurricanes we have in the gulf in a given season means winter will be colder but drier. Any truth to that? As I get older and learn more about climatology it seems reasonable.

submitted by /u/GrassAndKitties
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What effect does chromosome count have on an organism?

Posted: 23 Sep 2021 06:38 PM PDT

I don't mean when theyre missing or incomplete, i mean the whole amount. Humans have 23 pairs, dogs have 49, but then seemingly less complex things like certain plants and moths have over 300-400. Why do things need and have the amount of chromosomes they do?

submitted by /u/pinkufur
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How do bacteriostatic antibiotics eliminate an infection?

Posted: 23 Sep 2021 08:18 AM PDT

So bacteriostatic antibiotics only inhibit the growth/reproduction of bacteria, without directly killing the bacteria. How does this clear an infection? Do the bacteria die if they can't reproduce?

submitted by /u/working_entrepreneur
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If no one taught us what is supposed to smell good and bad, would we still recognise the same odours as pleasant and unpleasant? Or would we smell anything with a neutral approach? How does our brain decide which smells we like?

Posted: 23 Sep 2021 10:07 AM PDT

Why are the bands in a sarcomere of a muscle called specifically A Band, I Band, and H Band?

Posted: 23 Sep 2021 05:12 AM PDT
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Thursday, September 23, 2021

Why is the dark matter halo spherical?

Why is the dark matter halo spherical?

Why is the dark matter halo spherical?

Posted: 23 Sep 2021 03:54 AM PDT

Dilettante scientist here, so be gentle. As I understand it, galaxies are disc shaped due to the conservation of angular momentum, but the all the data I've seen about dark matter says that it is a roughly spherical distribution around the galaxy. Are there any theories as to why this is? Or is this evidence that dark matter doesn't even interact with itself?

submitted by /u/Formyedification
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Acne, why the face and the back?

Posted: 22 Sep 2021 01:45 PM PDT

Do viruses eventually reach some stable, optimal variant?

Posted: 22 Sep 2021 11:17 AM PDT

As a forewarning, I have a very limited understanding of biology and even less of virology, so this may be a very uniformed question. Viruses have their genetic information encoded into RNA, as I understand it. RNA is composed of several combinations of bases (ACUG), and these combinations functionally act as the viruses' code. Computers store information as bits, and there are a finite number of numbers that can be stored using any finite number of bits. My thinking is, since there are only so many combinations of A, C, U, and G in a strand of RNA with finite length, there are only so many virus variants possible. Eventually, selective pressures will force the disease to adopt some optimal configuration, such that any deviation from that variant creates a weaker virus. At this point would it be possible to create a vaccine that targets this specific variant, therein effectively nullifying the disease since any other variant would be unable to get past the vaccine that protects against the best virus?

submitted by /u/AsynchronousSwimming
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When an unstable isotope decays are the decay products always more stable than the original isotope?

Posted: 22 Sep 2021 08:05 PM PDT

If so, what is it about the weak interaction that makes such a decay path favourable?

submitted by /u/Immotommi
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Why don't we feel air pressure?

Posted: 22 Sep 2021 02:20 PM PDT

The standard explanation I've seen is that this is due to the air on all sides of us pushing equally, but that's not always the case. If I place my hand flat on a table, for example, there's no air under my hand to balance the pressure pressing down from the atmosphere.

Even apart from that aspect, I would still expect to experience the pressure even if it's balanced. I understand that our bodies don't collapse (or at least squish a bit) because they're basically incompressible (cavities excepted), but I would still expect to feel it. According to Wikipedia the air pressure at sea level is around 1kg/cm2, which is a lot, but I can pinch my arm with far less pressure than that and still feel it clearly. It's been a few years now, but I've also dived to a depth of around 12m where the pressure is significantly greater, and I don't recall a feeling of e.g. my legs being squeezed on all sides.

submitted by /u/nzlemming
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Do smartphone have any voltage stabilizer curcuit to stable the voltage when battery voltage is low?

Posted: 23 Sep 2021 12:59 AM PDT

Are there River Deltas that empty into a Lake and not a sea?

Posted: 23 Sep 2021 05:28 AM PDT

Did terrestrial flora exist before aquatic fauna moved out of the ocean?

Posted: 22 Sep 2021 05:06 PM PDT

At some point animals moved out of the ocean onto the land, before this happened was there a period when the land was covered in plants without any animals (or insects?) to eat them? Or did it happen simultaneously?

submitted by /u/LastHorseOnTheSand
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What was the classification of the sunspot that caused the Carrington Event?

Posted: 22 Sep 2021 08:59 AM PDT

I can't seem to find an answer from Googling, I'm not talking if it was an A/B/C/M/X flare, I know it was likely an X42. I'm looking for more of the sunspot composition (beta-delta-gamma, etc.) That produced the flare.

I've tried classifying it myself, but my knowledge is limited in comparison to the Space-Earth Sci nerds/professionals.

submitted by /u/NarcPTSD
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Why is most DNA double stranded??

Posted: 22 Sep 2021 03:55 AM PDT

There are single stranded viruses, as well as something called DNA triple helix,,

however most organisms have a double helix

What are the possible reasons for this???

submitted by /u/prof_awesomeness
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Why does some metal bend, while other metal shatters?

Posted: 21 Sep 2021 09:39 PM PDT

I watched a video of an industrial machine shredding engine parts, and noticed that the metal from the engine appeared to shatter instead of bend. Why is this?

submitted by /u/thermal7
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What will happen with dead body in space over time?

Posted: 21 Sep 2021 02:42 PM PDT

Hi! Let's imagine a human in space with no spacesuit. Of course he is dead. But what happens then? Will his body rot and decompose? Or is he just gonna float in space with no changes forever?

Btw sorry for my English :) It's my second language

submitted by /u/Famberlight
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