For light to qualify as a laser does it have to be emitted in a beam or does it just have to be of one wavelength?

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• For light to qualify as a laser does it have to be emitted in a beam or does it just have to be of one wavelength?
• Change in temperature as you increase in elevation is called a lapse rate, but what is the reverse called?
• will a nuclear bomb produced 20 or 30 years ago still detonate as it is planned?
• When an electron in an atom is excited, does its probability distribution instantly change from one shape to another, or is there a transitionary period?
• What exactly is color superconductivity?
• Is it possible for asteroids to contain incredibly huge gemstone cores?
• Can Carbon Dioxide exist as a liquid?
• Did the gauge bosons, from before the fundamental force separated into four, persist?
• I’ve heard that quantum computers can break encryption easily, why?
• Are we living in on higher ground than people in the past?
• How common are induced earthquakes?
• Is it possible to use a audio port to transmit data to a usb (bear with me I’ll explain it)?
• Can talking parrots have accents like us?
• Does space itself have any type of pressure?
• How do various sea creatures know when they have swum as deep as is safe for them?

For light to qualify as a laser does it have to be emitted in a beam or does it just have to be of one wavelength? Posted: 23 Nov 2019 12:38 PM PST If it does have to be a beam, what is the maximum spread it can have and still qualify? submitted by /u/quadraspididilis [link] [comments]

Change in temperature as you increase in elevation is called a lapse rate, but what is the reverse called? Posted: 24 Nov 2019 05:26 AM PST I know that lapse rate is defined as the decrease in temperature as height (elevation) increases. So what is an increase in temperature as elevation decreases called? For some reason extensive searching has not yielded me anything yet. submitted by /u/melvilleismycopilot [link] [comments]

will a nuclear bomb produced 20 or 30 years ago still detonate as it is planned? Posted: 24 Nov 2019 04:53 AM PST i always wondered what would happen if you deploy a nuclear bomb produced long time ago. obviously nobody has ever tried this so it all very theoretical. to get full force all components have to be very precisely calibrated but nuclear materials decay with time. is there a chance that it will go off but just create a lot of pollution without proper detonation? are the active materials supposed to be renewed once in a while? if so is anybody is doing this in reality? submitted by /u/edmundspriede [link] [comments]

When an electron in an atom is excited, does its probability distribution instantly change from one shape to another, or is there a transitionary period? Posted: 24 Nov 2019 04:22 AM PST If the latter, what does the distribution look like as it is shifting and how long does it take? submitted by /u/baquea [link] [comments]

What exactly is color superconductivity? Posted: 24 Nov 2019 04:02 AM PST I've googled it, but I'm having a hard time visualizing what exactly happens. submitted by /u/IAmCaelestis28 [link] [comments]

Is it possible for asteroids to contain incredibly huge gemstone cores? Posted: 23 Nov 2019 10:01 AM PST Im not familiar with the conditions required for precious stones to form, I know diamonds require a lot of pressure for the crystal structure to take form but not much else, could the conditions in an asteroid belt allow for lets say an emerald geode with a diameter in the dozens of meters? Also I see this sub doesnt consider geology a real science, really funny guys, bazinga... submitted by /u/BaconDragon69 [link] [comments]

Can Carbon Dioxide exist as a liquid? Posted: 23 Nov 2019 08:57 AM PST I understand that carbon dioxide can deposite as dry ice, and sublimate back to a gas, but can it melt or condense into a liquid? Is any place that carbon dioxide can be found naturally as a liquid, or is it only possible through artificial processes? submitted by /u/Funky7Monkey [link] [comments]

Did the gauge bosons, from before the fundamental force separated into four, persist? Posted: 23 Nov 2019 12:34 PM PST When the fundamental forces were unified they had different gauge bosons, such as the W1, W2, W3, and B particle for the electroweak force. All of which are massless and therefore stable. Would any of them have survived the separation of the fundamental forces? submitted by /u/daimonjidawn [link] [comments]

I’ve heard that quantum computers can break encryption easily, why? Posted: 23 Nov 2019 08:21 AM PST You can assume that I've a 101 level understanding of AES and Qbits. submitted by /u/GrannyRUcroquet [link] [comments]

Are we living in on higher ground than people in the past? Posted: 23 Nov 2019 05:06 PM PST As i was watching some documentaries, i saw some pattern. All these ancient buildings beneath the ground completely buried ( for example giza pyramid, moai heads, gobeklitepe) or cities being under sea. It is certain that sea levels changed all the time during earth's life. So these buildings were not buried by someone but earth itself. So layer upon layer, earth in the air, or carried from somewhere else or from volcanic eruption just fills this land and we think that it was always this high. submitted by /u/cenkiss [link] [comments]

How common are induced earthquakes? Posted: 23 Nov 2019 04:04 PM PST I've heard that humans can induce earthquakes through mining activity and fracking (although usually not enough to be felt) but I haven't been able to find any information on how much of all earthquakes worldwide are induced. submitted by /u/Kilo_G_looked_up [link] [comments]

Is it possible to use a audio port to transmit data to a usb (bear with me I’ll explain it)? Posted: 23 Nov 2019 09:09 AM PST So basically could you theoretically hook up the right sound to data in, microphone to data out, a battery or something for a power source and some crazy stuff with audio drivers/usb drivers to receive and transmit data through the audio jack. Idk it sound hypothetically possible I just feel like it would've been done by some hobbyist already. submitted by /u/mattreinstl [link] [comments]

Can talking parrots have accents like us? Posted: 22 Nov 2019 08:32 PM PST submitted by /u/mean_internet_troll [link] [comments]

Does space itself have any type of pressure? Posted: 22 Nov 2019 09:10 PM PST submitted by /u/kill23445 [link] [comments]

How do various sea creatures know when they have swum as deep as is safe for them? Posted: 22 Nov 2019 08:11 PM PST Animals live at various depths of water. Some stay closer to the surface. Some stay on the sea floor. What about the ones that swim to different depths? How do they know what their "comfort zone" is and that they are about to leave it? submitted by /u/1cecream4breakfast [link] [comments]

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How do doctors treat patients who are suffering from extreme starvation?

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• How do doctors treat patients who are suffering from extreme starvation?
• What is the different between Stresses and Pressures?
• How do haphazardly folded graphene sheets in carbon fibres provide greater strength than graphite?
• How does exercise promote muscle growth?
• Is there a lifeform which does not use DNA/RNA for its genetic code?
• Genetics : Can a "crossing over" happen between X and Y chromosomes ?
• Is the Endocannabinoid system part of the Autonomic Nervous System, or just a system that operates cohesively?

How do doctors treat patients who are suffering from extreme starvation? Posted: 22 Nov 2019 10:27 PM PST Inspired from this post: https://www.reddit.com/r/pics/comments/e093tq/an_emaciated_union_soldier_upon_his_release_from/ It makes sense that feeding someone in this condition can kill them, but how do doctors fine the line between feeding them too much and not enough? submitted by /u/Boarderdudeman [link] [comments]

What is the different between Stresses and Pressures? Posted: 23 Nov 2019 02:13 AM PST I am a fresh mechanical engineering student and as i start learning solid's mechanics , i am confused between the different of these two as they both have same formula ? Force by area. Thanks submitted by /u/chenchunwai [link] [comments]

How do haphazardly folded graphene sheets in carbon fibres provide greater strength than graphite? Posted: 22 Nov 2019 04:50 PM PST So layers of graphene in graphite are joined together via Van der Waals forces which are very weak. Carbon fibre is much much stronger than graphite. Wiki says that the main difference is the different interlocking methods, but doesn't explain how haphazardly folding these graphene sheets provides stronger bondage between all atoms. Any help is appreciated, thanks. submitted by /u/SSSSShield [link] [comments]

How does exercise promote muscle growth? Posted: 22 Nov 2019 07:19 AM PST I've just started going to the gym recently and this question just struck me and I didn't know the answer; hoping some of you guys can help! submitted by /u/Sazilorian [link] [comments]

Is there a lifeform which does not use DNA/RNA for its genetic code? Posted: 22 Nov 2019 07:12 AM PST I'm not sure if the title is the best way to word the question. After reading a thread earlier about viruses, I was reminded of something I read a long time ago, but I can't for the life of me remember what it was and my searches are turning up nothing. I remembered reading about some microorganism, I don't want to call it a Virus/Bacteria/Parasite because I'm not sure if that would be accurate, given the discussion I remember being that it was an "outlier" so to speak. It was something along the lines of it didn't use DNA/RNA for its genetic code, or had no common ancestor like everything else. I do remember it sparked theories of extraterrestrial origin (possibly dropped by a meteor, or was the original "life" on earth before something supplied what became life as we know it now, if that makes sense). Or it was "beat out" by DNA/RNA. Or it was some divergent phenomenon. I can't recall. Does this sound familiar to anyone? If so, what are the implications of the existence of such an organism? And could it in any way interact, affect or "infect" life as we currently know it if its "code" is so foreign? Thanks! submitted by /u/StarstruckCanuck [link] [comments]

Genetics : Can a "crossing over" happen between X and Y chromosomes ? Posted: 22 Nov 2019 09:12 AM PST Hey Askscience, I'd need help from some people that know a little in Genetics. In general, since X and Y chromosomes aren't homologous, the Y one being smaller, "crossing-overs" can't happen between then. In any way, I read in some science magazines, that the X and the Y chromosomes still have some homologous parts between them. So would this mean that a "crossing-over would happen ? ​ Background info : In bio class we had a test on genetics. The subject was on the color of a cat's robe, which depends on 2 allelles from X chromosomes. Eumelanin that codes a black fur and Phreomelanin that codes an orange fur. Plenty of female cats have a "tortie" fur, a mix of both colours, since they have 2 X chromosomes. Our aim was to show how certain male cats could have a "tortie" robe. The main answer was a trisomy, after during Anaphase I so one of the cells had 2X chrs, one with the Xn allelle and on with Xr allelle. If this cell had children, there could be one with XrXnY, which would be a male "tortie". If the loci of Xn and Xr aren't the same, there can be a crossing-over between the 2X's leading to one X having both allelles and the male descendant would also be "tortie". But if the loci of the allelles weren't specified in the test subject, we can perfectly extrapolate if the X and Y chromosomes have only a small Homologuous part, there can be a crossing-over between them (even really unlikely) so one allelle is on the Y chromosome, and a descendant could be XnYr or XrYn ? My teacher is really stubborn, she only believes in the magazine "Nature". But any renowned scientific could be ok. Can any of you help me on this subject ? Sincirely submitted by /u/PowerPINKPenny [link] [comments]

Is the Endocannabinoid system part of the Autonomic Nervous System, or just a system that operates cohesively? Posted: 21 Nov 2019 07:11 PM PST submitted by /u/ItsNotBigBrainTime [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

What caused this huge GDP per capita boost in 2002-2008?

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• What caused this huge GDP per capita boost in 2002-2008?
• How does dye stick to a fabric so hard that it hardly comes off even with modern detergents?
• Can we make EM Waves that create plasma by ionizing gases?
• How/why do separate species breed?
• Is the Oortcloud (est 0.03 to 3.2 ly) shared with other stars, ex Alpha Centauri (4,36ly) ?
• Is the galaxy a mostly flat plane like it’s depicted in pictures? If so, why?
• How do multiple generating stations know how much electricity to supply?
• In an episode of The Expanse, free floating human blood in zero g or near zero g formed into a "snowflake" crystalline shape when exposed to the vacuum of space. Would that really happen? Is there enough water in our blood for that or would other things like platelets and hemoglobin interfere?
• I've read that the reason water evaporates at room temperature, is because some molecules have enough energy to break free. Even ice evaporates. But then why doesn't every substance evaporate? Like metal or glass or rock.
• How did we distinct cell parts from each other? For example how did we know that a nucleus and the mitochondria isn’t the same thing? Also how did we figure out their functions?
• Is light reflected off matter or is light absorbed and then released?
• Why don’t rockets use outside air as an oxidizer while they are in the atmosphere?
• How does the transitivity of verbs very between languages? Meaning: Are some verbs always or almost always transitive in different languages? Are some verbs variable in whether they are transitive or intransitive across languages? Does every language have a concept of transitivity?
• Can getting struck by lightning really blow your shoes off? If so, how does that happen? What is the force that causes it?
• When friction occurs,what is happening on the atomic level?
• Why is an LED light more efficient?
• Why is the sitting position of birds stable despite looking like they should tip over?
• What is functional form in this plot of dielectric constant versus frequency of alternating current from a materials science introductory text?
• Are telescope images of objects such as galaxies that are hundreds or thousands of light years across, are they distorted?

What caused this huge GDP per capita boost in 2002-2008? Posted: 21 Nov 2019 03:25 PM PST Hi guys, I am 22 yo dude from Bulgaria who was looking at GDP per capita for Bulgaria, Serbia and Romania, but later on I checked for Germany and US as well. During the period of 2002-2008 there seems to have been a hugely massive economic boost to The Balkans in particular but other countries as well, and currently for the last 5 years it seems that most countries are not in a period of major growth, even less growth than during the great recession. Sadly for me during this period I was 5 yo so I dont really remember what happened and why submitted by /u/ll_Lucifer_ll [link] [comments]

How does dye stick to a fabric so hard that it hardly comes off even with modern detergents? Posted: 22 Nov 2019 05:52 AM PST submitted by /u/HoldThisBeer [link] [comments]

Can we make EM Waves that create plasma by ionizing gases? Posted: 22 Nov 2019 04:23 AM PST submitted by /u/Saeclum [link] [comments]

How/why do separate species breed? Posted: 21 Nov 2019 06:36 PM PST It's rare but different species have bred in the wild. But how? Why don't they attack one another like they normally would? For example, coyotes and wolves are two separate, but closely related, species that have bred without human interference. But they're rivals with different behavior. I assume they mate and then part. They can't rear the pups together, right? On that note, do coywolf pups get raised by single mothers or do males of their mother's species help, despite not being their pups? Another example I know of is Big Bird, the cactus finch. He somehow bred with completely different finches. How did he attract the females despite having the wrong call and being of the wrong species? I know his children couldn't attract anyone but each other despite having his call. submitted by /u/Gallantpride [link] [comments]

Is the Oortcloud (est 0.03 to 3.2 ly) shared with other stars, ex Alpha Centauri (4,36ly) ? Posted: 22 Nov 2019 06:31 AM PST I pictured the oortcloud as a far flung region of stuff loosely affected by the sun. But since it seems to stretch so far out that parts actually are closer to other stars wouldn't that make it shared? Or does it refer to the region of interstellar comets that are affected by our sun? But Doesn't the Alpha Centauri system have a higher mass than our sun shouldn't it be more affected then? ​ Or doesn't this have to do more with he fact that stars aren't static and are moving relative to each other so that the Oort cloud are "our" comets and they have theirs but since the distances are so huge and we aren't necessarily very close for too long it doesn't matter too much? submitted by /u/J-IP [link] [comments]

Is the galaxy a mostly flat plane like it’s depicted in pictures? If so, why? Posted: 21 Nov 2019 02:46 PM PST In most artistic depictions of the Milky Way galaxy, it's illustrated as a roughly flat 2 dimensional plane. What I was wondering is if that's really the case, or if solar bodies revolve "above" (relative to said 2D "plane") and "below" the center of the Milky Way? submitted by /u/badbakedpotato [link] [comments]

How do multiple generating stations know how much electricity to supply? Posted: 21 Nov 2019 03:31 PM PST Let's assume Generating Station A and Generating Station B are both supplying customers on the same grid. I understand electricity is fungible and they only know how much a customer uses by looking at a meter. I can hypothetically (but not practically) understand how total grid load is measured, and how a single generating station can tell how much electricity to generate for this grid demand. But when meeting an instantaneous grid demand, how do plant operators at Generating Station A know how much to supply the grid for their customers at a particular instant in time, and how do plant operators at Generating Station B know how to much supply their customers at a particular instant in time? Is there some sort of encoded signaling going on at the level of individual customer meters, to notify a specific generating station of the demand required? submitted by /u/multivacc [link] [comments]

In an episode of The Expanse, free floating human blood in zero g or near zero g formed into a "snowflake" crystalline shape when exposed to the vacuum of space. Would that really happen? Is there enough water in our blood for that or would other things like platelets and hemoglobin interfere? Posted: 21 Nov 2019 11:18 PM PST submitted by /u/TheFiredrake42 [link] [comments]

I've read that the reason water evaporates at room temperature, is because some molecules have enough energy to break free. Even ice evaporates. But then why doesn't every substance evaporate? Like metal or glass or rock. Posted: 21 Nov 2019 12:57 PM PST submitted by /u/SexyCrimes [link] [comments]

How did we distinct cell parts from each other? For example how did we know that a nucleus and the mitochondria isn’t the same thing? Also how did we figure out their functions? Posted: 21 Nov 2019 05:20 PM PST submitted by /u/lovers03 [link] [comments]

Is light reflected off matter or is light absorbed and then released? Posted: 21 Nov 2019 01:39 PM PST Are my curtains red because all other light is absorbed and (mostly) the red wavelengths are reflected, or does the fabric absorb the phiton and then release light of a red wavelength? submitted by /u/Fierytoadfriend [link] [comments]

Why don’t rockets use outside air as an oxidizer while they are in the atmosphere? Posted: 21 Nov 2019 01:04 PM PST So I was reading that jets have a very high specific impulse because use outside air and I know that this is impossible to do while a rocket is in space but why would a rocket not make use of outside air while it is still in the atmosphere to attain a higher specific impulse?Wiki Specific ImpulseNASA Air Breathing Rocket Engine Research submitted by /u/carsonroff [link] [comments]

How does the transitivity of verbs very between languages? Meaning: Are some verbs always or almost always transitive in different languages? Are some verbs variable in whether they are transitive or intransitive across languages? Does every language have a concept of transitivity? Posted: 21 Nov 2019 05:07 PM PST submitted by /u/iaswob [link] [comments]

Can getting struck by lightning really blow your shoes off? If so, how does that happen? What is the force that causes it? Posted: 21 Nov 2019 02:42 PM PST I've heard stories before about people getting struck by lightning and it blowing their shoes off. This morning one of my workmates (not someone who I believe makes things up or tells tall tales) told me a story about a guy he knew who was struck by lightning. As his story went, he was in a forest when a lightning storm began. He sat against a tree to wait the storm out. That tree was struck by lightning, which traveled through the tree and him. He suffered burns along his head and body and it "blew his boots off." Supposedly the force was so great that his boots, which were shin high, separated at the ankles and the bottoms were blown off. Is this story plausible? If so, what is the force that would cause this explosive separation? Also, why would it not destroy the person's feet in the process? submitted by /u/ImgurianAkom [link] [comments]

When friction occurs,what is happening on the atomic level? Posted: 21 Nov 2019 12:02 PM PST submitted by /u/TheSecondBlueberry [link] [comments]

Why is an LED light more efficient? Posted: 21 Nov 2019 11:55 AM PST Also idk what type of science this comes under submitted by /u/scanners123 [link] [comments]

Why is the sitting position of birds stable despite looking like they should tip over? Posted: 21 Nov 2019 12:52 PM PST Birds have the feet position of dinosaurs but have no tails. In most cases their apparent center of mass is forwards of their feet. This would cause them to fall over. What causes their true center of mass to be in a different position than it would appear? Secondly their legs attach to the body further back of where the feet touch the ground. This causes torque wanting to rotate the bird face down. How is this torque countered? Doesnt it put more stress on the joint? Also the pubis bone of birds has a pointy end pointing outwards. how is this not a problem? It looks like it would hurt if a bird hit a hard surface butt first. submitted by /u/OctupleCompressedCAT [link] [comments]

What is functional form in this plot of dielectric constant versus frequency of alternating current from a materials science introductory text? Posted: 21 Nov 2019 05:22 PM PST This is the plot taken from Callister 7th ed., pg. 710. I'm interested in the functional form of this plot because I'm looking for a function that is like a continuous step function - similar to the plot here but positively increasing. Does anyone know of such functions? Similar functions are the step function (obviously) and a sigmoid function but I'm looking for a function that is a mixture of both. Any help is always appreciated! submitted by /u/ulallume [link] [comments]

Are telescope images of objects such as galaxies that are hundreds or thousands of light years across, are they distorted? Posted: 21 Nov 2019 09:51 AM PST My thought process is that if you look at a galaxy from an angle that would put one end of the galaxy dozens if not hundreds of light years closer to us than the furthest end, would that mean that we are looking at a distorted image? submitted by /u/Cardenjs [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

At what point, specifically referencing Earth, does Euclidean geometry turn into non-Euclidean geometry?

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• At what point, specifically referencing Earth, does Euclidean geometry turn into non-Euclidean geometry?
• Do microwave ovens really leak?? Is this true? I always thought it's a shielded "box"!
• What would Jupiter look like from the surface of Ganymede?
• Many species of birds can see in UV light, but what experiment led to that discovery? And what caused birds to evolve sensitivity to UV light before their plumage was UV reflective?
• What if you took some simple scuba gear, maybe a weight, and applied a hydrophobic layer?
• Why Does The East Sky Turn Red At Sunset?
• Why do Novocain (or dental locla anesthesia) needles need to be so large and in such a sturdy applicator?
• what is the origin of a comet?
• What kind of physiques did prehistoric people have?
• How do the ways particles interact, change above the unification energy of the weak and electromagnetic interaction?
• Does oil filled heater consume oxygen / produce carbon monoxide?
• What invasive species invaded and destroyed ecosystems without the help of humans?
• If objects take an infinite time to fall into a black hole from our frame of reference, then how to black holes gain mass from our frame of reference?
• How did the perturbed orbits of planets/proto-planets in the early solar system become "circularized"?
• Where do animals get sodium in their diet from given that they don't eat salt ?
• When do interference patterns occur and what is the relation between interference and difraction?
• Is the fact that the LHC hasn't discovered supersymmetric particles evidence against string theory?
• What is biological memory?

At what point, specifically referencing Earth, does Euclidean geometry turn into non-Euclidean geometry? Posted: 20 Nov 2019 08:38 PM PST I'm thinking about how, for example, pilots can make three 90degree turns and end up at the same spot they started. However, if I'm rowing a boat in the ocean and row 50ft, make three 90degree turns and go 50ft each way, I would not end up in the same point as where I started; I would need to make four 90degree turns. What are the parameters that need to be in place so that three 90degree turns end up in the same start and end points? submitted by /u/AntarcticanJam [link] [comments]

Do microwave ovens really leak?? Is this true? I always thought it's a shielded "box"! Posted: 20 Nov 2019 07:23 PM PST Found this on YT. Is it legit? Or a hoax? I always worried about the radiation of a microwave oven, but this looks like a pretty good solution to check radiation leak (tell me if I'm wrong)... I always thought it's a shielded "box"! :-( https://www.youtube.com/watch?v=TZykotnSdoU submitted by /u/AzbesztMegbasz [link] [comments]

What would Jupiter look like from the surface of Ganymede? Posted: 20 Nov 2019 04:23 PM PST I am trying to write a science fiction story, and wish to keep it as hard as I can. Much of the plot centers around a settlement on Ganymede, and I would like to know how Jupiter would appear in the sky from the surface of the moon. submitted by /u/Ashybuttons [link] [comments]

Many species of birds can see in UV light, but what experiment led to that discovery? And what caused birds to evolve sensitivity to UV light before their plumage was UV reflective? Posted: 20 Nov 2019 04:26 PM PST submitted by /u/LeBlorqo [link] [comments]

What if you took some simple scuba gear, maybe a weight, and applied a hydrophobic layer? Posted: 20 Nov 2019 07:56 PM PST Let's say you put in ear plugs, wore goggles that covered the nose, a diving cap to hold your hair down, took a tank of air, and then sprayed everything in a hydrophobic layer. Would this allow you to go deeper into a body of water than if you just did this without the hydrophobic layer? The earplugs is obviously to counteract the pressure on the ear, goggles for the eyes and nose, where as the rest of the body seems to handle higher water pressures better than these areas, and the cap just to make the hydrophobic layer easier to create. Besides obviously not getting wet, with the weight of the tank, how far down could you walk on the ocean floor beyond the normal? Would this even have an effect? Would you need to bring more weights or would the layer allow you to just slip down? Or does this only seem like a cool idea in my head? submitted by /u/Inotamira_Orani [link] [comments]

Why Does The East Sky Turn Red At Sunset? Posted: 20 Nov 2019 02:45 PM PST This picture shows the sky in the East right after sunset. Why is the sky opposite the sunset becoming red? I understand that different wavelengths of light scattering more or less depending on the amount of atmosphere explains the sky being blue and sunsets being red, but I'm having a hard time understanding why the opposite sky is also red. submitted by /u/jpennin1 [link] [comments]

Why do Novocain (or dental locla anesthesia) needles need to be so large and in such a sturdy applicator? Posted: 20 Nov 2019 10:19 AM PST I ask because it seems like almost every other medical needle is not in such an industrial sized injector. Youd think a smaller needle would make it easier to get into the small spaces of the mouth. submitted by /u/lemons230 [link] [comments]

what is the origin of a comet? Posted: 20 Nov 2019 02:48 PM PST I just watched a new video on youtube uploaded by the infographics show. It talked about how there is a newly discovered comet coming towards our solar system and that it came from another star. This comet was caused by some "massive cosmic event." Does there always have to be a massive cosmic event for a comet to pass through our solar system? and would that event have to do with the star dying? Also do comets always come from stars? submitted by /u/schwndy [link] [comments]

What kind of physiques did prehistoric people have? Posted: 20 Nov 2019 11:14 AM PST So obviously people in prehistory (or even pre-industiral history) had to hunt/farm constantly, so every day would've been a struggle for survival. As a result, they'd obviously have to be very strong and have high endurance, and I've even heard it said that the average prehistoric human was as fit as an athlete is today. Would they look like modern athletes/ body builders though? Obviously, a body builder does specific movements to get a certain look, which I cant imagine would have any practical use back then. Would they even look "muscular", the way we think of it today, or would it all have been covered in stored fat reserves? submitted by /u/smmstv [link] [comments]

How do the ways particles interact, change above the unification energy of the weak and electromagnetic interaction? Posted: 20 Nov 2019 02:49 PM PST submitted by /u/KetchupStorm [link] [comments]

Does oil filled heater consume oxygen / produce carbon monoxide? Posted: 20 Nov 2019 11:38 AM PST There's a myth around here saying that any kind of direct heating like oil filled heaters or even turning on the AC on hot temperature would consume oxygen and make you suffocate. I tried asking around and googling it but no luck so far. I only got answers from people like me guessing from what they learned in school. I need a scientific answer for this matter. submitted by /u/Ziado0 [link] [comments]

What invasive species invaded and destroyed ecosystems without the help of humans? Posted: 20 Nov 2019 04:10 AM PST Like the cats destroyed birdlife in NZ, but only after humans brought them. submitted by /u/MarlinMr [link] [comments]

If objects take an infinite time to fall into a black hole from our frame of reference, then how to black holes gain mass from our frame of reference? Posted: 19 Nov 2019 07:15 PM PST From wikipedia: To a distant observer, clocks near a black hole would appear to tick more slowly than those further away from the black hole.[78] Due to this effect, known as gravitational time dilation, an object falling into a black hole appears to slow as it approaches the event horizon, taking an infinite time to reach it. How does this work in terms of us nonetheless observing that black holes do 'consume' matter and gain mass? And conversely, if from our reference frame nothing ever actually falls into the event horizon but approaches it over infinite time, then how does the black hole information theory paradox arise? Do we not then see an imprint of all matter at the edge of the event horizon? submitted by /u/nmsl_chinese [link] [comments]

How did the perturbed orbits of planets/proto-planets in the early solar system become "circularized"? Posted: 20 Nov 2019 10:34 AM PST For example Jupiter, which is thought to have moved out from the inner solar system via encounters with Saturn. Or the hypothesized Planet 9, which could have been throw out past the Oort Cloud. Or any other body that has been flung by a larger body. It's my current understanding that these perturbations would produce a very elliptical orbit, with the perturbed body still coming back down into a similar AU. For instance a spacecraft must perform a burn at the highest point in its orbit to circularize. But what mechanism causes a body flung out into a distant location to stay there? submitted by /u/Bobbar84 [link] [comments]

Where do animals get sodium in their diet from given that they don't eat salt ? Posted: 20 Nov 2019 02:46 AM PST submitted by /u/VoileTop [link] [comments]

When do interference patterns occur and what is the relation between interference and difraction? Posted: 20 Nov 2019 06:25 AM PST Hi, I was wondering if someone could explain to me where interference patterns come from and how do they relate to electron diffraction. I understand the phenomenom of diffraction and know the difference between the two types (constructive and destructive) but I don´t get the way in which the waves must cross over to create the interference pattern. Also, I came across interference patterns that arose from electron diffraction by graphite and I was wondering how electron diffraction connects to interference. Thanks to anyone who takes the time to help me on this! submitted by /u/Julia-Ash [link] [comments]

Is the fact that the LHC hasn't discovered supersymmetric particles evidence against string theory? Posted: 20 Nov 2019 09:01 AM PST AFAIK, all current versions of string theory predict the existence of supersymmetric particles, and the LHC doesn't seem to have found any. I remember watching a TED talk from before the LHC was turned on, in which Brian Greene seemed very excited at the possibility that it could detect supersymmetric particles. Does this indicate that string theory is probably wrong? Do string theorists have an explanation for why the LHC wouldn't find any supersymmetric particles? submitted by /u/RepresentativePop [link] [comments]

What is biological memory? Posted: 20 Nov 2019 08:55 AM PST On a molecular level, what is "memory"? Mechanically speaking? Is it an arrangment of molecules? A particular sequence of synaptic transmission? How is the data stored within neurons? Speaking mostly about biological lifetime/cognitive memory rather than DNA codes. submitted by /u/Swimreadmed [link] [comments]

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