Why don't humans have mating seasons? |
- Why don't humans have mating seasons?
- Hummingbirds flap their wings around 70 times per second during normal flight...what is the fastest natural movement that humans are capable of, either voluntary or involuntary?
- what, precisely, is the difference between a dipole-dipole interaction and a "hydrogen bond"? Why is a hydrogen bond (a) different and (b) stronger?
- Does water have a high heat capacity because it is a polar molecule? Do all polar molecules have high heat capacity?
- How does a pencil eraser work?
- Why does water form little spheres when thrown in the air, versus just spreading out into a random blob?
- Has the string theory been validated by any experimental evidence like from the LHC?
- What's the current state of Thorium Molten Salt Reactor research?
- How common is prion resistance/immunity in humans?
- How are percent chances of rain, storms, etc. determined?
- Does increasing orbital angular momentum cause electromagnetic radiation to travel slower through a material?
- What happens when Thermite burns asphalt?
- Does the density of air change in a controlled volume, if we change the temperature inside the box?
- Can energy be generated through the color force?
- How does the huge arch over Chernobyl work?
- At whitch speed would you hit/be hit by the fewer amount of rain drops?
- What sort of symptoms of radiation poisoning (if any) can be seen in plant life?
- Will denser objects sink forever?
| Why don't humans have mating seasons? Posted: 05 Jun 2017 01:28 AM PDT |
| Posted: 04 Jun 2017 07:48 AM PDT My daughter was watching a cartoon on PBS this morning and they were talking about pollination. It was mentioned that hummingbirds are capable of flapping their wings upwards of 200 times per second. After a quick google, it seems 70 is the more common number for "normal" flight. That's obviously still extremely fast and made me wonder what humans are capable of in terms of pure speed, so I thought I'd ask here. [link] [comments]  |
| Posted: 05 Jun 2017 05:08 AM PDT People typically just give the reason that it's the electronegativity difference. But that's wrong - HCl does not show hydrogen bonding - just look at the boiling points - it's very clear that only HF, H2O and NH3 have hydrogen bonding here. There's a huge offset from the rest of the trend because of them. CLEARLY the electronegativity is not the full story, because HCl is not showing anything off-trend in that plot, yet has a bigger electronegativity difference than NH3 does. I went down the rabbit hole of thinking it was because it had to be period 2 elements - because then they were smaller and therefore had a better orbital overlap with hydrogen, creating a stronger bonding interaction. But NOPE. That's not the explanation either. I found some chem papers floating around that are talking of hydrogen bonding in H2S. WTF? I look on wikipedia and see that hydrogen bonds are supposedly why water gets such a high boiling point whereas H2S doesn't, because H2S doesn't hydrogen bond. Um. GUYS. Does it or doesn't it?? wtf even IS a hydrogen bond anymore?? if it's just a dipole-dipole thing then why have its own name??! and what's the deal with water's boiling point?? if it ISN'T just that then what IS it? what differentiates it? I find it maddenning that literally nowhere clarifies this. All it EVER says is lists molecules that hydrogen bond and ones that don't, and states NO REASON why those specific ones do or don't or what the flipping difference is supposed to be. WHATS THE DIFFERENCE? FOR example. How do I tell whether the electrostatic interactions in HS are hydrogen bonding or not? BEYOND something vacuuous like "oh it's a sulfur therefore we don't call it that". There are papers out there that DO call it that. [link] [comments]  |
| Posted: 04 Jun 2017 05:48 PM PDT |
| How does a pencil eraser work? Posted: 04 Jun 2017 05:51 PM PDT Chemically or mechanically, what happens when an eraser rubs off lead/graphite from a paper? Why doesn't this work for, say, ink? [link] [comments]  |
| Posted: 05 Jun 2017 06:42 AM PDT |
| Has the string theory been validated by any experimental evidence like from the LHC? Posted: 05 Jun 2017 03:45 AM PDT Are there better contenders for the theory of everything? I know just the basics of what the string theory is, that is using vibrating strings and extra dimensions to explain all the different forces and particles. I come from a medical background, so please excuse any gross misunderstandings of the concept. [link] [comments]  |
| What's the current state of Thorium Molten Salt Reactor research? Posted: 04 Jun 2017 09:46 AM PDT From time to time talk about Thorium / Molten Salt Reactors pops up as possible solution to our energy problem. As far as I can see it's far away from being well-funded research nowadays. Can someone explain why we put billions into fusion reactor research and not closely enough into Thorium / Molten Salt Reactor research? Also: What is the current state of research? How far would we realistically be away from having such reactors? [link] [comments]  |
| How common is prion resistance/immunity in humans? Posted: 04 Jun 2017 09:21 AM PDT I have general anxiety disorder, and recently I have been losing sleep over a prion phobia. So, how common is genetic resistance to prion disorders in humans? Specifically, my family is of southern Chinese background, and I would like to know if prion resistance would be common in a typical southern Chinese genotype. Thank you. [link] [comments]  |
| How are percent chances of rain, storms, etc. determined? Posted: 04 Jun 2017 05:26 PM PDT I'm curious to learn how those percentages are determined, and why they vary from station to station. I also would like to know why we can't be more exact and how "surprise" storms occur with little to no warning. [link] [comments]  |
| Posted: 05 Jun 2017 04:19 AM PDT Or rather, can you cause electromagnetic radiation to have more interactions with a material before leaving by increasing its OAM? [link] [comments]  |
| What happens when Thermite burns asphalt? Posted: 04 Jun 2017 05:03 PM PDT I was watching videos on the Battle of Britain, more so memoirs of those involved. And recalled a documentary mentioning the allies use of thermite bombs in cities during late war. Can't remember the documentary though. Even if not historically true, what would happen to Asphalt when burned by thermite? Thanks [link] [comments]  |
| Does the density of air change in a controlled volume, if we change the temperature inside the box? Posted: 04 Jun 2017 08:21 AM PDT Since density is mass over volume, and the mass isn't changing, and the volume isn't changing, does the density of air not change? [link] [comments]  |
| Can energy be generated through the color force? Posted: 04 Jun 2017 06:04 PM PDT Generating usable energy seems to be done by exploiting one of the four fundamental forces. Gravity can be harnessed by dams, electromagnetism by chemical reactions such as the combustion of gasoline, the weak nuclear force through fission, and the strong nuclear force through fusion. I realize that the strong nuclear force and color force are fundamentally the same interaction, but they are distinct. Matter can be created by applying energy trying to separate quarks due to confinement, is the reverse possible? [link] [comments]  |
| How does the huge arch over Chernobyl work? Posted: 04 Jun 2017 09:43 AM PDT How does it keep radiation from getting out? Will it help the surrounding area or just keep the reactor from contaminating it more? Is it actually worth it if it's only going to last 100 years, when the radiation will last hundreds of thousands of years? [link] [comments]  |
| At whitch speed would you hit/be hit by the fewer amount of rain drops? Posted: 04 Jun 2017 07:27 AM PDT |
| What sort of symptoms of radiation poisoning (if any) can be seen in plant life? Posted: 04 Jun 2017 06:30 AM PDT |
| Will denser objects sink forever? Posted: 04 Jun 2017 02:00 AM PDT If you hve an infinite column of water and place an object denser than water in it, will that object sink forever? I don't think it will because if pressure inside the water is pgh, then there must be some height h where the pressure balances out the pressure exerted by the object and the water on top, right? Say water area is A, density is 1, and height is H. And object area is A, density is 2, and height is h. And gravity g is 10. So if the object is in the water, it displaces the water on top. So now there is water on top of the object, and the water below the object feels the force of both weights. Force of water on top of object is 1AH*g = 10AH. Force of object is 2Ah*g = 20Ah Adding both forces gives 10AH + 20Ah. Pressure is force/area, so we get (10H + 20h) for pressure. Is there any height in the water column that will support this pressure and prevent sinking? [link] [comments]  |
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