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Thursday, January 2, 2020

Why does your appetite slow down when you’re sick?

Why does your appetite slow down when you’re sick?


Why does your appetite slow down when you’re sick?

Posted: 01 Jan 2020 02:50 PM PST

How much light is actually reflected by a mirror?

Posted: 01 Jan 2020 07:23 AM PST

I know a mirror doesn't reflect 100% of light so what's the percentage and can anything actually Reflect 100% of light

submitted by /u/yasohi
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Is urine really sterile?

Posted: 02 Jan 2020 06:52 AM PST

I'm not thinking about drinking it obviously, it's just something I'm curious about because every time I look it up I get mixed answers. Some websites say yes, others no. I figured I could probably get a better answer here.

submitted by /u/WeatherWolf31
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Is melatonin in breastmilk stored or expressed during feeding?

Posted: 02 Jan 2020 06:52 AM PST

Just wondering. I know melatonin levels in breastmilk are higher in the evening and early morning. But, is it stored at those times or does the body secrete it during letdown? If I last breastfed at 12 midnight, will i get the same melatonin content if there was no breastfeeding or pumping until, say 8 in the morning?

submitted by /u/doctoryt
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At what height does it become dangerous to jump into water?

Posted: 02 Jan 2020 02:40 AM PST

I believe the high jump of most diving boards is about 30 feet.

So, at what point could it result in injury or even death if you jumped into water? Would a jump from, say, 50 feet be dangerous?

submitted by /u/a5g1
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When people hang upside down, how does the body keep stomach acid in the stomach and not sliding down someone’s throat?

Posted: 01 Jan 2020 10:18 PM PST

When you stick your arm out of the window on the freeway, how come the friction from the air rolling across your skin cools you off instead of warming you up?

Posted: 02 Jan 2020 06:40 AM PST

So i know that when your rub your hands together when you are cold, they warm up because matter is rubbing up against matter. Air is matter, so why does it cool us down when it blows across us very fast when we drive down the road, even in the summer when the air is warmer?

submitted by /u/Grapesbossk
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Do people with smaller tongues have fewer taste buds, or a higher density of taste buds? and if so, does this effect taste sensitivity?

Posted: 01 Jan 2020 03:32 PM PST

How badly do massive bushfires affect the atmosphere in terms of long term post-fire effects?

Posted: 01 Jan 2020 01:57 PM PST

In Australia, over 3 million hectares of bushland has been burned. Are there going to be any dangerous long term effects, or any permanent ones?

submitted by /u/GarunixReborn
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Can you learn a language in your sleep?

Posted: 01 Jan 2020 05:53 PM PST

There are many "learn a new language in sleep" videos that have a voice repeat words for hours on end, Have there been any studies on the topic?

submitted by /u/Oidvin
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Are there any lifeforms that don't rely on sunlight (even indirectly)?

Posted: 01 Jan 2020 03:12 PM PST

Can any lifeforms survive without sunlight?

Objectively speaking, chemoautotrophs don't create energy from sunlight, so they don't directly rely on the sun. But according to several sources, this is misleading. I saw that the chemoautotrophs in Lechuguilla, for example, use atmospheric oxygen (derived from sunlight-driven photosynthesis) as an electron acceptor. Indirectly, they're still reliant on the sun's energy.

Are there any cases of chemoautotrophs (or other lifeforms) which have zero reliance on the sun's energy? Perhaps lava tube microbial mats, or the bacteria around deep sea vents? I'm hoping to hear about lifeforms which could survive unaffected if the solar system suddenly went dark, which the Lechuguillan chemotrophs (presumably) could not.

As an extension to this question, if sunlight-independent chemoautotrophs do exist, do they produce enough energy to provide for other animals? Is a deep sea vent, for example, home to a complicated ecosystem, with chemoautotrophs as the primary producer?

submitted by /u/Glade_Kayda
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Why do we say that there was no time before Big Bang?

Posted: 02 Jan 2020 02:48 AM PST

If we observed space to be expanding, it means things were tiny once. So maybe everything exploded away from each other a long time ago. This is all about space though. It doesn't mean that time didn't when space was tiny. In fact, 'time didn't exist prior to Big Bang' also seems incomprehensible. Do people who say that have any idea what it means? That's because anything and everything exists inside time. Time is pretty much the stage where things exist. If we're theorizing the birth of time, we're pretty much saying everything just popped out of nothing.

submitted by /u/TraditionalWishbone
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How does the location of the brake caliper on the disc affect braking performance?

Posted: 01 Jan 2020 05:03 PM PST

Why are they on the front side for front wheels and on the rear side for rear wheels? I have noticed that this is the case for most (all?) cars.

submitted by /u/hukkum_ka_ikka
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Polarization of light with tartrate crystals in a fluid... but how?

Posted: 01 Jan 2020 08:04 PM PST

I was watching a youtube video last night about when Pasteur discovered left/right handed molecules due to the way that the crystals polarized light when dissolved in a fluid.

My question would be - how in the world would polarization work with crystals in a fluid? Wouldn't the crystal orientation be every direction possible? Is there something else going on there? I would think that anything suspended in a fluid is going to be highly chaotic.

Thanks

submitted by /u/chickenbarf
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How does gravitational time dilation cause the effect of Shapiro Time Delay?

Posted: 02 Jan 2020 01:24 AM PST

How do observers detect a time delay for light traveling through a vacuum versus light traveling through a vacuum near an object of strong gravity but the same distance? If time is passing more slowly for light as it gets closer to the massive body then shouldn't it seem to be traveling faster to the outside observers since it will be covering the same distance in less time (from the reference frame of the light)? or at least take the same amount of time to the outside observer? What am I not getting?

submitted by /u/CalvinHobbesCombo
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What kinds of chemicals make a perfume smell 'sweet', and why do we associate them with sweet tastes?

Posted: 02 Jan 2020 12:39 AM PST

I have some air freshener that's so sickly sweet that being in the room with it is like drinking a pint of syrup. What's going on here?

submitted by /u/TheBananaKing
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How can some fish, for example salmon, survive in both, sweet and saltwater?

Posted: 01 Jan 2020 11:05 AM PST

I know that seafish cope with high salt levels through elevated osmolarity compared to mammals. Sea mammals like dolphins have powerful kidneys. So how do wanderfish adapt when alternating between sweet and saltwater? Change of inner osmolarity? Powerful kidneys? Something else?

submitted by /u/sloth_is_life
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In John B. Calhoun's behavioral sink experiments, what would have been the conditions of a control group of mice?

Posted: 01 Jan 2020 06:23 PM PST

Scientifically speaking, does the practice of 'mewing' (adopting correct tongue posture) improve jawline/ facial features?

Posted: 01 Jan 2020 09:19 PM PST

Anyone with experience/expertise; it would be great if you could share your knowledge.

submitted by /u/NaiveManufacturer1
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Could any stripped down commercial jet break the sound barrier?

Posted: 01 Jan 2020 05:29 PM PST

I've read that 500 million animals have died due to the NSW fires; what will be the long-term impact of this on the NSW ecosystem and at what point does that number become irrevocably catastrophic for the NSW ecosystem?

Posted: 01 Jan 2020 06:09 AM PST

How much of our sense of humor is dictated by genetics?

Posted: 01 Jan 2020 11:41 AM PST

What's the science behind the Hiroshima and Nagasaki bombs? Why were they still airborne when they detonated?

Posted: 01 Jan 2020 03:33 PM PST

Wednesday, January 1, 2020

How fast does blood flow in a human body?

How fast does blood flow in a human body?


How fast does blood flow in a human body?

Posted: 31 Dec 2019 09:12 PM PST

How fast and how far does blood flow with each pump of the human heart?

How much force does the average human heart contract with?

How does oxygen get transferred to every cell in the body, is there a capillary leading to every individual cell?

And how exactly does blood get through tiny areas in the body, is there some mechanism for even distribution of pressure? (The blood in my pinky toe is so far from the heart, how does it get back?)

submitted by /u/LemonsNeedHelp
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What would happen if you boiled bleach? (sodium hypochlorite bleach not oxygen bleach)

Posted: 31 Dec 2019 09:54 PM PST

How come when a person yawns while listening to music,the music sounds different?

Posted: 01 Jan 2020 02:26 AM PST

Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology

Posted: 01 Jan 2020 07:12 AM PST

Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology

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
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Is there a temperature below which a match will no longer strike?

Posted: 31 Dec 2019 11:37 AM PST

How does eating in abnormal quantities (e.g. morbidly obese people) affect frequency of defecation and quantity?

Posted: 31 Dec 2019 08:58 AM PST

Basically, I was wondering if people who eat in huge quantities defecate multiple times per day or if they simply defecate in larger amounts but regular frequency.

submitted by /u/bl00dshooter
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What might be the incidence of undetected cancer (all kinds) that the immune system stops before it becomes a clinical issue?

Posted: 31 Dec 2019 10:04 AM PST

Checkpoint inhibitors "take the breaks off" the immune system to enable it to attack tumors that express e.g. PD-1. This leads me to wonder how frequently an individual might have somatic mutations that are potentially carcinogenic, but the immune system destroys the mutated cell lines before it ever becomes a clinical issue.

Obviously there aren't epidemiological studies detailing the incidence of this, but I'm wondering if my line of thinking above is correct, and if it is, what might be a reasonable estimate if the frequency of this happening over the lifetime of an individual, or incidence across the population as a whole.

submitted by /u/neurone214
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How to make a beaker disappear?

Posted: 31 Dec 2019 05:20 PM PST

I saw this video on Twitter where a smaller beaker inserted into a larger one gradually becomes invisible as a liquid that looks denser than water is gradually poured into it. The explanation the gave was that the liquid and the beaker had the same refractive index but I believe there's more to it than that. I look forward to having someone shed some light on this. The link to the video: https://twitter.com/PhysicsVideo_/status/1208729536117927936?s=19

submitted by /u/Khalifayaq
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What in your body actually causes an orgasm?

Posted: 30 Dec 2019 04:17 PM PST

Is there a certain concentration of specific hormones needed to cause an orgasm?

submitted by /u/ZFC19
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Tuesday, December 31, 2019

Why do people with Down Syndrome look the same/very very similar?

Why do people with Down Syndrome look the same/very very similar?


Why do people with Down Syndrome look the same/very very similar?

Posted: 30 Dec 2019 10:28 AM PST

I feel somewhat bad for asking this question, obviously I know they are all unique but they do seem to share very similar facial characteristics.

submitted by /u/Rapioo
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How exactly did knights in full suits of armor actually go about killing eachother?

Posted: 31 Dec 2019 02:01 AM PST

What makes certain things bounce and what are the factors that determine if an object is "bouncy"?

Posted: 31 Dec 2019 02:07 AM PST

Why is the continental shelf brake at ~450' below sea level uniformly worldwide?

Posted: 30 Dec 2019 02:29 PM PST

How do high air temperatures (>50degrees C) affect the epicuticular wax on pine and spruce needles? Will the effects lead to moisture loss in the plants?

Posted: 31 Dec 2019 02:21 AM PST

Is it possible for 2 separate species to eventually evolve into the same species again?

Posted: 30 Dec 2019 10:21 PM PST

What are the effects of fiber on the absorption of fructose?

Posted: 31 Dec 2019 01:24 AM PST

What effect does consuming fiber have on the absorption of fructose by the liver? Does the fiber just slow the process down by diluting the fructose in your stomach or is there another mechanism in play?

submitted by /u/VankoSiropa
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What kind of carabineers are used in space walks?

Posted: 30 Dec 2019 10:13 AM PST

Do they have to account for how cold it is in space? Are they speciality made? Could I take some used for rock climbing and use them for a space walk?

submitted by /u/spbingham
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Does lift depend on the distance from the ground ?

Posted: 31 Dec 2019 03:01 AM PST

I saw a picture of the largest diamond pit mine in the world, in Russia, with text claiming that it is so large and so deep that helicopters flying over it drop, as if sucked in. To what extent does lift depend on the ground (apart from the ground effect) exhibited by flying close to the ground or water surface)?

Here's one of the sites reporting that helicopters flying over the pit get sucked in:

https://www.atlasobscura.com/places/mir-diamond-mine

I had learned that lift has been demonstrated to come primarily from mass flow diverted downward by a wing or rotor, and to a much lesser extent by the Bernoulli effect. If this is so, lift should not change if a helicopter flies over a huge pit mine.

Is the pit mine helicopter-sucking story real? And if so, how does that work?

submitted by /u/Berkamin
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How did species survive in the days just after the K-Pg Extinction event?

Posted: 30 Dec 2019 09:26 AM PST

The K-Pg Extinction event (aka the Chicxulub impact, widely known as being the impact that killed the dinosaurs) "devastated the global environment, mainly through a lingering impact winter which halted photosynthesis in plants and plankton" (Wikipedia). And yet numerous different species, the ancestors of all organisms today, somehow pulled through.

How, exactly, could anything survive this? How did plants survive without sunlight, or animals survive without anything to eat? I can understand scavenging for days and weeks on dead plant matter and decaying cadavers, but how was this sustainable for months and years? I just don't get what the means of survival were for long enough for the dust clouds to subside and photosynthesis to resume.

Thanks for any insight.

submitted by /u/tannhauser_busch
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Can we filter gametes for genetic defects and use them for IVF?

Posted: 31 Dec 2019 01:41 AM PST

I think that altering embryonic human DNA is illegal (based on coverage of that Chinese doctor who was recently convicted), but even if that's true for embryos AND gametes, maybe it's legal to just filter them.

Is that possible with today's technology? And if we could filter out defects, could we filter for desirable genes?

submitted by /u/LeoRidesHisBike
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About the matter and antimatter imbalance. Is it possible that anti matter galaxies exist beyond the observable universe?

Posted: 30 Dec 2019 06:44 AM PST

It is often said that humans and chimps share ~99% of their DNA. How is this calculated?

Posted: 30 Dec 2019 10:19 PM PST

I am not asking how they gather this data. Rather, is the percentage calculated by base pairs, codons, or individual genes? (E.g. Amount of different base pairs divided by the total amount of base pairs)

I'm wondering because this has a potentially significant impact on how the same data is presented. Lets say humans have 4 genes. If we take one normative human and one human with sickle cell anemia (a point mutation) if you calculate by individual genes their dna is 25% different. If you do it by base pairs they are virtually exactly the same.

I would assume that it is by codons, and I know that this seems relatively trivial and unimportant but the answer will change how I view these statistics.

Edit: spelling

submitted by /u/Ponji-
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How is it that some animals can go months without eating? Don't they get hungry?

Posted: 30 Dec 2019 09:14 PM PST

Why do we squint when trying to see better?

Posted: 30 Dec 2019 07:35 AM PST

How much evidence is there to support the idea that altruism in humans is innate?

Posted: 30 Dec 2019 03:08 AM PST

Just saw this on reddit and it's really fascinating but I'm not sure how much the idea of innate altruism is supported. I once heard a biologist speak rather negatively of it. Is there any evidence that we actually are wired to help one another?

submitted by /u/Treygalle
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Does exercising a tongue make it bigger like other muscles?

Posted: 29 Dec 2019 08:58 PM PST

"Regular" (for lack of a better term) muscles will get bigger and stronger when put through exercise like going to the gym but I was wondering, if you could for example lift weights with your tongue, would your tongue get bigger? Would it make any sort of change it?

submitted by /u/The-IT
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Monday, December 30, 2019

When a person gets into an accident of some sort and gets an open wound, that dirt, gravel, sand, etc. then goes into, how do hospitals clean the wound and stop infection?

When a person gets into an accident of some sort and gets an open wound, that dirt, gravel, sand, etc. then goes into, how do hospitals clean the wound and stop infection?


When a person gets into an accident of some sort and gets an open wound, that dirt, gravel, sand, etc. then goes into, how do hospitals clean the wound and stop infection?

Posted: 29 Dec 2019 07:27 PM PST

Is there evidence that psychotherapy by a professional is effective compared to a control group in which the professional is replaced with a random person? Or with a book or similar text-based method?

Posted: 29 Dec 2019 07:52 PM PST

Betelgeuse. I have read were it has finished burning hydrogen and passed to exclusively burning helium but we are not sure if it has started carbon burn (because neutrino signal too week to tell). But how do we know it moved to exclusively burning helium?

Posted: 30 Dec 2019 01:03 AM PST

We know shell activity gives no conclusive information about core activity so most astronomers think the current change in luminosity is simply part of the regular dimming cycle. Does that statement of no conclusive information also extend to spectral analysis of the shell?

edit *yes, burn may not be the right term, but you know what I mean.

submitted by /u/GuangoJohn
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Why weren't these fossils cover by lava and ash?

Posted: 29 Dec 2019 06:37 PM PST

We are told that the last eruption of Yellowstone's Super-volcano was 640,000 years ago. The Teton Range, which borders Yellowstone, started rising up from the plain some 9 million years ago. The Tetons are full of sea fossils and petrified wood. One boulder field in particular (which sits at at about 10,000 feet elevation) has thousands of visible fossils that are from the Cambrian period, which would have been deposited on the ocean floor some 2.5 billion years ago. My question is this: if the Tetons began their appearance 9 million years ago, and those fossils started at the bottom and were then forever on the top of the Teton Range, why were all of these fossils not covered by lava and ash during Yellowstone's last eruption? Could the Tetons be younger than suspected? Or did Yellowstone blow a lot longer ago than science tells us? Give me your thoughts/theories! I have asked this to geologists, volcanologists, and paleontologists, and none of them have had an answer.

submitted by /u/I-Fiddle
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How do computers/calculators find the square roots of numbers?

Posted: 29 Dec 2019 08:10 PM PST

If you drop a ball at different strengths of gravity, how would their bounces compare?

Posted: 29 Dec 2019 09:38 PM PST

Let's say you drop a ball on the moon and the earth with the same starting height, would they bounce back up to different heights?

submitted by /u/yarlow
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What happens when you test the intermediate axis theorem in 4 dimensions? Can it even happen, since there are two, or do they both rotate?

Posted: 29 Dec 2019 01:41 PM PST

How does depth factor into magnitude of water particle motion in ocean waves?

Posted: 30 Dec 2019 01:34 AM PST

I have recently being trying to understand ocean waves, and the forces involved, here for starters.

If we imagine a shallow divider fixed in the ocean, as crudely shown below. Will the section of water confined in A, while being open to air above and water below, still rise and fall as normal? As I understand it yes.

What will happen if we extend the divider deeper towards the ocean floor, but not reaching it, will the motion of the water confined in A now change, and how?

~ ~ | — | ~~~~~~

 A 

➡️wave direction

———————

submitted by /u/edwardsainsbury
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Can non-aquatic birds hold their breath, and if so for how long?

Posted: 29 Dec 2019 04:49 PM PST

To narrow things down I'm specifically wondering if a starling could hold its breath for any period of time. I haven't managed to find any useful answers online which aren't specifically for aquatic birds. Sources would be appreciated as well if possible.

submitted by /u/B0nse24
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Why exactly does electroconvulsive therapy result in memory loss?

Posted: 29 Dec 2019 11:47 PM PST

Are there arcs of a rainbow that are 'warmer' because they are refracting infrared light?

Posted: 29 Dec 2019 01:58 PM PST

Rainbows obviously refract visible light at different wavelengths. I assume this refraction continues on the rest of the electromagnetic spectrum, including infrared light. My understanding is that infrared light is synonymous with heat. Therefore, would the area of a rainbow beyond the red arc, which would logically refract infrared light, be measurably warmer?

submitted by /u/1917-was-lit
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what is snot exactly? what's happening to my nose and respiratory apparatus during a cold?

Posted: 29 Dec 2019 12:30 PM PST

what is snot exactly? where is it made? what's it purpose? why do I get it during a cold?

The way I "feel" it it's being secreted in my nasal cavities, but is it? My best guess would be it helps keeping the viral infection in my respiratory tract in check, is that correct? how exactly does it achieve that?

After I wake up I'm clogged with it, and it seems like it gets a bit harder and less fluid, it also changes color, from whiteish to yellowish, is it sitting in my nasal cavity and throat and "hardens" there?

when I blow it feels like it's reaching my ears, and then slowly trickels down again, is this what's happening?is it actually getting all the way to my ears?

If I suck it in instead of blowing it it then feels like a small portion of it actually gets in my throat, is that what's happening? that doesn't sound like it's a good idea to do, is it?

and what about the mucus that I cough up during a cold, is that the same as the snot I blow from my nose? that feels like it's coming straight from my lungs, is it?

submitted by /u/anthabit
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What does the Partition Function actually mean in a physical sense? Why does it contain all the information for the thermodynamical properties of the system?

Posted: 29 Dec 2019 12:14 PM PST

I mean this from the perspective of statistical mechanics:

I get that the partition function is the "Normalization factor" of the probability calculation for the different states. But I don't get why does that mean that we can derive a system's energy, etc. so easily from it.

Is this just a result of some algebraic miracle (that somehow the calculation for the average energy by traditional methods coincides with the one using the partition function)? Or is there some deeper meaning to the partition function that makes it as useful as it is?

submitted by /u/pando93
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Why are high divers okay jumping into water from high up, but jumping off a bridge will kill you?

Posted: 29 Dec 2019 12:39 PM PST

What ultimately causes a balloon to pop when a match is put up to it?

Posted: 29 Dec 2019 07:04 PM PST

How do we know how far away something is?

Posted: 29 Dec 2019 12:57 PM PST

I recently saw a post of a needle galaxy that's 50 million light years away. So how do we know that it's that far away?

Another question that comes to mind: Does light always travel in a linear path?

submitted by /u/YertIsXXL
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What is the frequency of light given off by an atomic bomb and what factors determine the frequency of light?

Posted: 29 Dec 2019 08:46 AM PST

How are commercial scale cooked products made safe to store?

Posted: 29 Dec 2019 05:53 PM PST

So it's pretty common knowledge that if you cook something like chicken, and leave it out on the bench at room temperature for a day or two, it may be dangerous to eat. If you refridgerate it, it's good for a few days, and if you freeze it, it can be good for a while.

I understand this is because dangerous bacteria live and breed in certain temperatures (I was always told 5-60c), and if you ingest a large enough mass of those bacteria, they'll mess you up?

I've read online that if you cook something yourself and freeze it, it'll stay good for up to 6 months. But if you go out and buy a frozen dinner from the supermarket, it usually has a use by date a year or two into the future.

The last few years the supermarkets around me have started to stock 'fresh' refridgerated meals, that don't come frozen. If I cook a curry or something and put it in the fridge, it can start to go bad after 4-5 days, but most of these supermarket meals have use by dates into the weeks, sometimes as high as 3 weeks.

Even more recently (like last month or so), I've started to see completely unrefridgerated versions of these meals. Things like chicken curries that have a use by date of 6 months (!!!).

So my question is, what technology do companies use to achieve these gains in the food storage space? I'm particularly interested about the unrefridgerated stuff, since it's appeared in my area recently. Has there been new advances in food science that the general public might not be aware of?

submitted by /u/gandalfintraining
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Did Ancient Scribes Suffer From Carpal Tunnel Issues?

Posted: 29 Dec 2019 10:52 AM PST

Working on a keyboard/mouse can give us life-long injuries... I'd imagine working with pen/paper or stone/chisel as a job- they'd have some problems as well. Is there anything we know about that is mentioned in ancient texts about scribe's hand/wrist/arm being in pain from the job?

submitted by /u/odawg21
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Why aren't stents removed after some period of time?

Posted: 29 Dec 2019 08:58 AM PST

When a patient gets implanted with stents, why arent the stents removed and why are they permanent. shouldn't the plaque buildup in the arteries have been broken down by then?

submitted by /u/Oxygenated1234
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