What is the point of using screws with a Phillips head, flathead, allen, hex, etc. instead of just having one universal screw type?

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• What is the point of using screws with a Phillips head, flathead, allen, hex, etc. instead of just having one universal screw type?
• Can a spider tell its silk from other spiders' silk?
• How do lakes, ponds, and rivers, and even puddles retain water without it seeping away into the ground, as if I dug a hole and poured water into it?
• What will happen to the Voyager spacecraft if they never come into contact with anything?
• If two cars following each other are doing the speed of sound, and the one in back honks, would the front car hear it?
• How would I construct a physical object that has exactly one "bit" (or "nat") of entropy?
• Why do we find C14 in diamonds?
• Why are nuclear bombs activated above their target and not on ground impact?
• Why does life exist so relatively close to absolute zero, -273.14C, versus the "hottest" temperature, Planck Temperature over 1 decillion Celsius?
• Why does the Derivative term often add to instability in PID controllers?
• Can seemingly clear gases be seen with electromagnetic waves not visible to the human eye?
• How does a Boiling water reaction work?
• Why do dogs shake water off their bodies from front to back, instead of shaking it all off at the same time?
• Why is so common 12V and not 10V or 15V?
• Why are rain clouds dark?
• Why can't you donate blood after an endoscopy?
• What does it mean that photons are the force carriers for electromagnetism?
• Given that irrational numbers, such as pi, will inevitably include every possible sequence of digits, is it also inevitable that they will, at some point, include a series of sequential digits that is longer than the chain of digits preceding it?
• What are the theorized properties of stable super heavy elements?
• how do displacement currents flow through the plates of a capacitor?

What is the point of using screws with a Phillips head, flathead, allen, hex, etc. instead of just having one universal screw type? Posted: 27 May 2017 12:59 PM PDT submitted by /u/EthanNewb [link] [comments]

Can a spider tell its silk from other spiders' silk? Posted: 27 May 2017 11:15 AM PDT submitted by /u/saiosen [link] [comments]

How do lakes, ponds, and rivers, and even puddles retain water without it seeping away into the ground, as if I dug a hole and poured water into it? Posted: 27 May 2017 06:30 PM PDT I know how people make their own artificial lakes, but they need to put a tarp down to keep the water from draining away. How do rivers and such not have water seep away through the ground? submitted by /u/rextoooo [link] [comments]

What will happen to the Voyager spacecraft if they never come into contact with anything? Posted: 27 May 2017 06:59 PM PDT Considering space is mostly 'empty' and that the distance between stars, galaxies and other structures is huge, is it possible that the voyager spacecraft could continue to travel forever without hitting anything? Could it theoretically outlive stars, and make it to the end of the universe? Or would the metals and materials its made of eventually break down? It amazes me that a human-made object could potentially outlive humanity, and even our sun! submitted by /u/cc2491cc [link] [comments]

If two cars following each other are doing the speed of sound, and the one in back honks, would the front car hear it? Posted: 27 May 2017 07:43 PM PDT submitted by /u/Johnnie2shoes [link] [comments]

How would I construct a physical object that has exactly one "bit" (or "nat") of entropy? Posted: 28 May 2017 03:19 AM PDT submitted by /u/thetimujin [link] [comments]

Why do we find C14 in diamonds? Posted: 27 May 2017 11:32 PM PDT One argument I often find posed by Creationists is that C14 is found in subterranean materials which should be too old to have it, such as diamonds and coal deposits. Thus, the materials cannot be as old as posited by standard dating. Do we actually find C14 in these materials, and if so why? submitted by /u/csvan [link] [comments]

Why are nuclear bombs activated above their target and not on ground impact? Posted: 28 May 2017 07:03 AM PDT submitted by /u/mountainkingmonty [link] [comments]

Why does life exist so relatively close to absolute zero, -273.14C, versus the "hottest" temperature, Planck Temperature over 1 decillion Celsius? Posted: 27 May 2017 05:12 PM PDT submitted by /u/chunkykitty [link] [comments]

Why does the Derivative term often add to instability in PID controllers? Posted: 27 May 2017 04:58 PM PDT If possible I'd like an explanation in terms of the actual math behind it. Unfortunately the Wikipedia page has a citation but it was never defined. https://en.m.wikipedia.org/wiki/PID_controller#Derivative_term submitted by /u/TheKLaMike [link] [comments]

Can seemingly clear gases be seen with electromagnetic waves not visible to the human eye? Posted: 27 May 2017 02:19 PM PDT Saw this on the front page and started thinking about all the things that can only be seen with infrared and made me wonder if it worked with Oxygen or nitrogen or some other seemingly clear gas. submitted by /u/Yoshi1592 [link] [comments]

How does a Boiling water reaction work? Posted: 28 May 2017 03:53 AM PDT For a physics project I'm reasearching how a BWR works. I know the basics by know but I can't seem to find a clear answer to my questions: Other than in the turbines is there an efficiency rate? I mean is there a loss in energy from the boiling water in the reactor towards the turbines. Also, it would be really helpful if anyone could tell me how you calculate the mass of the Uranium when knowing the total annual effect. I've got mostly everything else for my project but these two questions are hard. Anyone care to help? submitted by /u/TheSwecurse [link] [comments]

Why do dogs shake water off their bodies from front to back, instead of shaking it all off at the same time? Posted: 27 May 2017 04:28 PM PDT See this gif: http://i.imgur.com/UUyVeIV.gifv The dog is spraying the water off his body at the front, then the middle, then it finally shakes off the back and tail. Why does this happen/why does the dog do this? submitted by /u/Jatexi [link] [comments]

Why is so common 12V and not 10V or 15V? Posted: 27 May 2017 05:01 PM PDT submitted by /u/Gomosito [link] [comments]

Why are rain clouds dark? Posted: 27 May 2017 03:38 PM PDT submitted by /u/TheKLaMike [link] [comments]

Why can't you donate blood after an endoscopy? Posted: 27 May 2017 11:42 AM PDT In the UK you cannot donate blood for 4 months after an endoscopy. Considering the procedure doesn't interfere with your blood, or leave physical impacts on your body (hopefully), why is this? submitted by /u/blacknightcat [link] [comments]

What does it mean that photons are the force carriers for electromagnetism? Posted: 27 May 2017 01:53 PM PDT I understand that a photon is a self-propagating wave in the electromagnetic field, and I understand at some level that charged particles interact by exchanging photons... but how does that actually work? It sounds like it means that charged particles are constantly emitting photons, which is what gives them their charge, but that seems impossible (where would all the energy come from?). What's actually going on when two particles interact? submitted by /u/sgt_zarathustra [link] [comments]

Given that irrational numbers, such as pi, will inevitably include every possible sequence of digits, is it also inevitable that they will, at some point, include a series of sequential digits that is longer than the chain of digits preceding it? Posted: 27 May 2017 02:31 PM PDT That is to say, is there some point in pi where there is a series of sequential 4's longer than the amount of numbers preceding it? If it is not inevitable, then how would you go about calculating the probability that such an event would occur? Is it possible to calculate that probability for any arbitrary infinite string of digits? If so, what is it? Edit: spelling. submitted by /u/notaprotist [link] [comments]

What are the theorized properties of stable super heavy elements? Posted: 27 May 2017 06:13 PM PDT Are there any solid ideas of what properties any super heavy elements in the island of stability might have, based on their group, crystal structure, or anything else? submitted by /u/mo9722 [link] [comments]

how do displacement currents flow through the plates of a capacitor? Posted: 27 May 2017 12:42 PM PDT Suppose there is a capacitor connected to a battery . If conduction currents can't flow through the plates of a capacitor , how is it possible for displacement currents to do so? Also , how are they equal in magnitude as conduction currents ? submitted by /u/momo90503 [link] [comments]

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Why do we have to fry food in oil?

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• Why do we have to fry food in oil?
• Why are there no green stars?
• Are there non continuous macroscopic physical quantities?
• What is the maximum achievable Data transfer rate from Mars to Earth?
• Why, when I'm tired and trying to fall asleep, do I feel like I'm falling or slipping and make a random spasm without consciously trying to?
• Why is the speed of light the speed that it is?
• May longitudinal eletric field oscillations be considered EM waves?
• If it is impossible to accelerate something to the speed of light, what happens to the energy that you expend if you try?
• How is the amount of dark matter and dark energy calculated?
• Is there a way to determine the radius of a black hole, or would anything of the sort be a guess?
• Are there any kind of chemical reactions that would achieve temperatures colder than -10C?
• How are sodium and potassium exchanged in neurons without a reaction?
• Can you measure how far a storm is from you by lightning?
• Is a 100-character message encoded with a 100-character randomized key completely safe from decryption without that key?
• Do the planets orbit the sun on a flat plane like shown in diagrams and mock-ups of the solar system?
• Would Buzz Aldrin's footprints still be visible on the moon today from Apollo 11?
• Why is the induction of anesthesia slower with more soluble anesthetic gases?
• If qubits can be 0 and 1 at the same time, how is information stored in a quantum computer?
• Is the hardness of a material determined by it's melting point?
• How big are quarks compared to us? For instance, are we as big to quarks as the observable universe is to us? Are we somewhere in the middle between quarks and the observable universe in terms of size?

Why do we have to fry food in oil? Posted: 27 May 2017 12:47 AM PDT Fried food tastes delicious, and I know that you can "fry" items in hot air but it isn't as good. Basically my question is what physical properties of oil make it an ideal medium for cooking food to have that crunchy exterior? Why doesn't boiling water achieve the same effect? I assume it has to do with specific heat capacity. Any thoughts? submitted by /u/PirateWenchTula [link] [comments]

Why are there no green stars? Posted: 27 May 2017 04:50 AM PDT So I was reading a space book with my 5yo talking about different stars, their colours and temperatures. From cool to hit the scale went Red, Orange, Yellow, White And Blue. Tl ;dr; Why do stars go from yellow to white to blue, rather than through green like a rainbow? submitted by /u/GSV-CargoCult [link] [comments]

Are there non continuous macroscopic physical quantities? Posted: 27 May 2017 05:16 AM PDT Temperature, speed, pressure, energy... are all continuous in any situation, to the best of my knowledge. Even square waves are in practice continuous. Do non continuous macroscopic physical quantities exist? Why or why not? submitted by /u/Hykarus [link] [comments]

What is the maximum achievable Data transfer rate from Mars to Earth? Posted: 27 May 2017 05:16 AM PDT Mars being a center of attention for human colonization and search for extraterrestrial life, several probes are being planned to be sent to Mars in near future (2020). Once landed, those probes will be able to collect huge amount of interesting data and images. Between Mars (orbiter satellite) and Earth, current data transfer rate seems quite slow (3 to 128 kbps). Faster data transmission would accelerate the exploration of the red planet. What is the maximum data transfer rate that can be achieved by 2020 using current technologies? Is it possible to boost the data transmission by at least a magnitude (Mbps)? How? submitted by /u/graviboson [link] [comments]

Why, when I'm tired and trying to fall asleep, do I feel like I'm falling or slipping and make a random spasm without consciously trying to? Posted: 26 May 2017 03:53 PM PDT Basically this. Whenever I'm tired or sometimes just trying to fall asleep, I sometimes get this feeling that I'm falling and will make a random spasm without trying to. What is this and why does it happen? submitted by /u/Stefmonster33 [link] [comments]

Why is the speed of light the speed that it is? Posted: 26 May 2017 12:47 PM PDT Put another way, what about the universe would have to change for the speed of light to be one kilometer per hour faster or slower? submitted by /u/Galileo228 [link] [comments]

May longitudinal eletric field oscillations be considered EM waves? Posted: 26 May 2017 09:50 PM PDT EM waves must be transverse because of the way the oscillations on electric and magnetic fields perpetuate each other as they propagate from the source. However, even without this mechanism, imagine this: You have two eletrically charged spheres near each other, each one being held on their place by a spring that allows them to move in the direction in which they are aligned (see drawing below). Here's the drawing of it (this would be the system in the equilibrium state)(sorry for being lazy to draw the electric fields) The electric field both produces is strong enough to cause the other to oscillate if you move one of them. And then, you pull one of them, making it oscillate and making both work as oscillators coupled by the electric field. In this scenario, the variation of the field (that corroborates with the motion) occurs in the same direction they oscillate. And as nothing can propagate instantaneously, this oscillations must propagate through the space between both. So, it's an oscilation in the electric field, that's propagating between them and transfering energy from one to other. Why can't it be considered as an wave? Even if in a small scale, as it decays rapdly as the distance increases, differently from an transverse EM wave (like the very-low energy transverse EM waves that they would be producing during this). Other scenario i could propose to simply talk about the longitudinal variation of electric field would be the field in the front of an flat charged surface (like a thin metal sqare) as you change it's charge, making it positively and then negatively charged. submitted by /u/guferr [link] [comments]

If it is impossible to accelerate something to the speed of light, what happens to the energy that you expend if you try? Posted: 26 May 2017 07:16 PM PDT It has to go somewhere, so where is it all going? submitted by /u/MiseroMCS [link] [comments]

How is the amount of dark matter and dark energy calculated? Posted: 27 May 2017 12:31 AM PDT Sorry if im awnseringy own question, but dark matter is calculated based on how much baryonic matter would be requiered to have the gravitational effect dark matter causes, rigth? This one would assume that a given amount, be it regular or dark matter, will always have equal amount of gravitational pull. But then we have dark energy which is kinda like anti gravity, and there is supposed to be more of this than the former two combined. Well for dark matter we already defined that everything has equal amount of gravitational pull, then how does this not apply to dark energy? The way I see it, we would have to say something like universe is made out of 20% normal matter, 80% dark matter and negative 300% of dark energy. Either that or a given amount of energy does not have a given amount of gravity. Why isnt it so? submitted by /u/empire314 [link] [comments]

Is there a way to determine the radius of a black hole, or would anything of the sort be a guess? Posted: 26 May 2017 02:59 PM PDT submitted by /u/buffsop [link] [comments]

Are there any kind of chemical reactions that would achieve temperatures colder than -10C? Posted: 27 May 2017 03:09 AM PDT submitted by /u/know618 [link] [comments]

How are sodium and potassium exchanged in neurons without a reaction? Posted: 26 May 2017 04:40 PM PDT From my basic understanding of chemistry sodium and potassium pathways open and close causing polarization to make an electrical current. Which is called action potential. How is this executed without the highly reactive nak being made or bonded? submitted by /u/sacredgeometry13 [link] [comments]

Can you measure how far a storm is from you by lightning? Posted: 26 May 2017 12:15 PM PDT I learned when I was younger that when you see a flash of lightning, every five seconds you count is a mile (for how far the storm is from you). Wasn't completely sure if that was completely accurate or just a good educated guess. submitted by /u/Cup_of_Morning_Joe [link] [comments]

Is a 100-character message encoded with a 100-character randomized key completely safe from decryption without that key? Posted: 26 May 2017 09:24 PM PDT I heard in conversation a while ago that if you have a 100-character message string encoded with a 100-character key string of randomized characters, then there's no way to decrypt without the key. Since they key is 100% random and unknown, each character is exactly as likely to be any character, causing no discernible patterns to form in the encoded message. To explain in simplified form, in case I'm not using terms correctly (no knowledge of cryptology beyond anecdote): Message: 1122334455 Randomized Key: 9403609884 (add digits to encode) Encoded message: 0525933239 Because the key is a randomized set of digits, the encoded message (without the key) is equally likely to be any of the 10-billion 10-digit strings, if I'm thinking through this correctly. Is this actually the case? And then, ancillary questions (I don't really see any rules against these, they're just sort of where my mind goes when I think about this situation, feel free to answer or ignore if they're too much.) How secure is a 100-character message encoded with, this time, a randomized but repeating 10-character key? Does the "key length-to-message length" ratio affect the situation in any quantifiable way? Would this simple form of encryption be unusable for some practical reason outside of mathematics, or is there some mathematical way to break a code like this, (preferably communicated in a way a person with only an undergraduate in mathematics will understand)? submitted by /u/sid_lordoftheflame [link] [comments]

Do the planets orbit the sun on a flat plane like shown in diagrams and mock-ups of the solar system? Posted: 26 May 2017 12:27 PM PDT Most posters and images I see of the solar system shows all the planets on a flat planet was wondering if that was actually the case. Edit: I'm on mobile and wasn't able to add a flair, my apologies. submitted by /u/CreepnGames [link] [comments]

Would Buzz Aldrin's footprints still be visible on the moon today from Apollo 11? Posted: 26 May 2017 11:28 AM PDT submitted by /u/stark0788 [link] [comments]

Why is the induction of anesthesia slower with more soluble anesthetic gases? Posted: 26 May 2017 03:09 PM PDT When comparing two anesthetic gases with different solubilities, the induction of anesthesia is quicker with a less soluble anesthetic (Let's say Nitrous oxide compared to halothane). I know that it must be related to the partial pressure of the anesthetic in CNS but I cannot understand how or why. Thank you. submitted by /u/udenizc [link] [comments]

If qubits can be 0 and 1 at the same time, how is information stored in a quantum computer? Posted: 26 May 2017 12:44 PM PDT submitted by /u/biguysrule [link] [comments]

Is the hardness of a material determined by it's melting point? Posted: 26 May 2017 05:05 PM PDT Is the hardness of a material determined by the melting point it has? Like, diamond is pretty hard. Is that because it has a high melting point? If so, could you, in theory, make ice as hard as diamond just by decreasing it's temperature? submitted by /u/Heythrowawey [link] [comments]

How big are quarks compared to us? For instance, are we as big to quarks as the observable universe is to us? Are we somewhere in the middle between quarks and the observable universe in terms of size? Posted: 26 May 2017 09:25 AM PDT submitted by /u/stater354 [link] [comments]

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If quantim computers become a widespread stable technololgy will there be any way to protect our communications with encryption? Will we just have to resign ourselves to the fact that people would be listening in on us?

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• If quantim computers become a widespread stable technololgy will there be any way to protect our communications with encryption? Will we just have to resign ourselves to the fact that people would be listening in on us?
• Are there any physical laws preventing a reaction that produces an anti-proton and a positron from a proton and an electron?
• Is it true that giant mushrooms existed?
• Is it possible to detect gravity lensing caused by Sun from Lagrange L2?
• Why doesn't temperature change during a phase change?
• How is a monument like Devils Tower in Wyoming created? I understand how mountains and volcanoes are created but a monument like that seems to vertical for it to be the result of smashing tectonic plates. Something else must be involved???
• Why do clouds become dark when it's about to rain?
• Do local sea levels in the ocean change with the seasons? In other words, is there a "tidal" high and low that is driven by temperature instead of the moon?
• Does the time in the other galaxies is like the time on Earth?
• What would happen if you separated a fertilized human egg cell right after it split for the first time?
• Does intense concentration cause the brain to use up more glucose?
• How was this video made?
• How does the band of stability work?
• How soon do electrons stop flowing when the p.d. is removed from a circuit?
• How will we know when we reach perfect values for physical constants that require measurement like G or e-?

If quantim computers become a widespread stable technololgy will there be any way to protect our communications with encryption? Will we just have to resign ourselves to the fact that people would be listening in on us? Posted: 26 May 2017 05:45 AM PDT submitted by /u/LanceThunder [link] [comments]

Are there any physical laws preventing a reaction that produces an anti-proton and a positron from a proton and an electron? Posted: 26 May 2017 06:27 AM PDT Such a reaction would conserve mass and charge, but are there any other conservations it would violate? If not, why isn't this reaction prevalent throughout Sci-fi as a way of achieving 100% mass-to-energy conversion (by subsequent reaction with matter) submitted by /u/lexapi [link] [comments]

Is it true that giant mushrooms existed? Posted: 26 May 2017 12:58 AM PDT I've heard about giant mushrooms exsited before the trees came. Is this true and if it is how is this possible? submitted by /u/KalleTheOne [link] [comments]

Is it possible to detect gravity lensing caused by Sun from Lagrange L2? Posted: 26 May 2017 03:23 AM PDT Einstein predicted gravitional lensing and made calculations to measure lensing caused by Sun. Due to Sun being bright(duh!) it is impossible to observe it from Earth on regular day. This year in US there will be total Solar Eclipse that will allow to measure this effect again(forgot name of team that did it first) and giving more proff to Einstein theories. My question is, is it possible to measure this effect via satelites that are placed in L2 point? Over there Earth is always in front of a Sun so it should cover Sun just like Moon does during Eclipse. Here thou I say sorry for any mistakes I did in text above. submitted by /u/Ijjergom [link] [comments]

Why doesn't temperature change during a phase change? Posted: 25 May 2017 05:53 PM PDT I was wondering what's so special about the melting point, boiling point etc. that makes temperature constant during these phase changes. I get that the molecules are being rearranged and the input of heat will allow them to break the intermolecular attractions that hold them in a particular phase, but why is there a point where this is so dramatic, if the IMFs are always being broken during the heating process (i.e. density is temperature dependent)? Thanks in advance! submitted by /u/borednerd7 [link] [comments]

How is a monument like Devils Tower in Wyoming created? I understand how mountains and volcanoes are created but a monument like that seems to vertical for it to be the result of smashing tectonic plates. Something else must be involved??? Posted: 25 May 2017 07:36 PM PDT submitted by /u/shanemv4 [link] [comments]

Why do clouds become dark when it's about to rain? Posted: 25 May 2017 01:53 PM PDT submitted by /u/kaptionless [link] [comments]

Do local sea levels in the ocean change with the seasons? In other words, is there a "tidal" high and low that is driven by temperature instead of the moon? Posted: 25 May 2017 05:54 PM PDT The ocean's mass will remain about the same, I understand that. But water's density is a function of temperature, so given a difference in the temperature of a region of the ocean in winter and a region of the ocean in the summer, the density of the ocean will vary. Assuming the following conditions (one being ocean in absolute winter, one being ocean in peak summer) consider the difference in volume between the two conditions: Temp. (degrees centigrade) Density (slugs/cubic foot) 32 1.940 80 1.934 This is a mere .31% change in volume, but consider the total volume of the ocean is 300,000,000 cubic miles Does that mean that the 'summer' side of the globe has 93 million more cubic miles of ocean than the 'winter' side? If the earth's surface is 196.6 million cubic miles, that would mean temperature can raise or lower sea levels by almost half a mile! I know this doesn't happen, I know there are thermal gradients that connect the peak high and low temperatures of ocean, and I know that the ocean is an open system and will want to self level. But do we see sea levels rise and fall slightly with average temperature? I would assume that shore lines would not notice this change because of ocean depth being small, and this difference being tremendous when the ocean is deep. Thanks in advance. submitted by /u/WhereThePeachesGrow [link] [comments]

Does the time in the other galaxies is like the time on Earth? Posted: 26 May 2017 01:37 AM PDT What I am trying to say is does the time in Andromeda or other galaxy is slower or faster compaired to ours becouse they are moving(maybe with different speed)? And if I were on spaceship that is not in any galaxy and it is completely stopped, how different would the time go for me compaired to someone that is on Earth? I can't get this questions out of my head.(Sorry for my bad English) submitted by /u/Mitko199 [link] [comments]

What would happen if you separated a fertilized human egg cell right after it split for the first time? Posted: 25 May 2017 12:26 PM PDT submitted by /u/pheonixkit [link] [comments]

Does intense concentration cause the brain to use up more glucose? Posted: 25 May 2017 06:13 AM PDT and if so does one need to eat more while studying? plz say yes. submitted by /u/killybegssealion [link] [comments]

How was this video made? Posted: 25 May 2017 01:24 PM PDT Very nice, but how it was done? https://www.youtube.com/watch?v=kesRiQbm9V0 submitted by /u/nichram [link] [comments]

How does the band of stability work? Posted: 25 May 2017 03:42 PM PDT I don't understand why there is a certain ratio that satisfies the "band of stability." Why are the isotopes that lie outside the band unstable? submitted by /u/PoopsEveryday [link] [comments]

How soon do electrons stop flowing when the p.d. is removed from a circuit? Posted: 25 May 2017 10:19 AM PDT And what causes the force which decelerates the electrons in the wire? Also, for a loop of wire forming a high voltage circuit 1 light year long, how long would​ you have to wait after removing the voltage so that it is safe to touch the bare wire half way along? Edit: voltage submitted by /u/xkimlam [link] [comments]

How will we know when we reach perfect values for physical constants that require measurement like G or e-? Posted: 25 May 2017 12:17 PM PDT submitted by /u/TimAnEnchanter [link] [comments]

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