Water is clear. Why is snow white? |
- Water is clear. Why is snow white?
- Does light have "Harmonic frequencies" like audio does?
- Why do lasers have to be a single wavelength? Could you create the illusion of a white laser by combining the beams of a red, green, and a blue laser?
- Why does cold air hold less water than warmer air?
- Can neutron star material halt gamma rays?
- On average, what percentage of the Earth is on fire?
- Can the event horizon of an evaporating black hole shrink to reveal things that were once on the inside?
- [Biology] During the time of the dinosaurs, from what I've heard, the Earth was in a tropical state. Were there any polar ice caps at all? Were there colder-climate dinos?
- On a bicycle, why are higher gears larger in the front but smaller in the back?
- Is Rayleigh-Taylor Instability the main reason flames are turbulent?
- Is the cholesterol theory sound?
- How do you measure the Earth's core temperature?
- Aluminium, copper, zinc coins + water + baking soda = a very nasty coating. Which metal reacted?
- The temperature at the south pole occasionally falls below -78.5C, the sublimation point of dry ice. When it gets this cold, why doesn't it 'snow' dry ice as it freezes out of the air?
- What are "cosmic rays"?
- Why do all burning things smell vaguely the same to us?
- What would the chemical properties of elements with g, h, i, k orbitals be? Do we also know or can we predict the chemical properties of elements in the Island of Stability?
- How much of an effect would my phone have on a plane if I didn't put it in airplane mode?[Engineering]
| Water is clear. Why is snow white? Posted: 09 Dec 2016 03:33 AM PST |
| Does light have "Harmonic frequencies" like audio does? Posted: 08 Dec 2016 08:36 PM PST Does light have "Harmonic frequencies" in the same way audio has Harmonies? [link] [comments]  |
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| Why does cold air hold less water than warmer air? Posted: 08 Dec 2016 08:53 PM PST I understand that in general more water vapor can be present in warmer air than in colder - I'm trying to understand how temperature factors into this. Is it because water is more likely to exist in a gas state when it's warmer or is it more a property of the air that allows it to hold more water vapor? [link] [comments]  |
| Can neutron star material halt gamma rays? Posted: 08 Dec 2016 09:41 PM PST I remember learning that paper can stop alpha particles, aluminum can stop bets particles, and not even a thick sheet of lead can stop gamma rays entirely. I was wondering if there is any substance which can stop gamma rays entirely, like maybe neutron star material since it's so dense? [link] [comments]  |
| On average, what percentage of the Earth is on fire? Posted: 08 Dec 2016 01:26 PM PST The recent wildfires got me thinking. Wildfires are BIG. I wouldn't guess this number to be too big, but if even 1% of my home were on fire, that'd be a huge deal. [link] [comments]  |
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| On a bicycle, why are higher gears larger in the front but smaller in the back? Posted: 09 Dec 2016 01:27 AM PST |
| Is Rayleigh-Taylor Instability the main reason flames are turbulent? Posted: 08 Dec 2016 07:25 PM PST I'm a visual effects artist who does a lot of flame/smoke/explosion effects. As with all effects, I like to know what actually happens physically so that I can have a better knowledge on how to replicate the effect. It's hard to find all information on the subject in one place, but what I've been able to piece together is that the licks of flames are created by a collision of hot air (fire) hitting cooler, more dense air (atmosphere). This then creates Rayleigh-Taylor instability, and therefore turbulence on the leading flame front. If this is not accurate, what is the main cause of turbulence in flames, and why are flames not instead laminar flows? Thank you. [link] [comments]  |
| Is the cholesterol theory sound? Posted: 09 Dec 2016 02:15 AM PST Does statin use actually save lives? Are people with high cholesterol more likely to die from clogged arteries than people with low cholesterol? There is a community of cardiologists, other doctors and lay people who claim that the cholesterol-lowering approach to heart disease is at best a mistake, at worst a fraud and extremely harmful. They contend (pretty universally without much difference among their theses) that inflammation and/or sugar create endothelial tears. Blaming cholesterol for patching the lesions is like blaming a fireman for putting out a fire. They claim every cell can make cholesterol because it's so vital to life processes such as transporting vitamins and patching aforementioned holes. The most perplexing claim to me is how often I see these authors claim that there is no proof that high cholesterol is associated with or is a cause of heart disease mortality rates; that as many people with low cholesterol die of heart attacks as do those with high cholesterol. They claim that the statin culture is a fraud and a lie. I can't understand how so many smart medical people would fall for this lie, unless the pharmaceutical companies own the post-med-school physician education system. Is there good, repeatable, verified, peer-reviewed, robust science behind the cholesterol-lowering heart disease treatment? Side note: statins cause myopathy and diabetes; they attack muscles; they obliterate the cellular energy process (so statin users supplement with Co-Q-10). Personally and online I know hundreds of people whose lives statins have ruined. Statins are a multi-billion dollar industry. Motive, means and opportunity for committing a huge scam is definitely in place. But what about the science, are doctors depending on bogus big pharma statistics wrangling or is there really good science behind attempting to lower cholesterol. THANK YOU! Sources: Dr. Duane Graveline, NASA doc, physically disabled by statin use https://www.spacedoc.com/ The Great Cholesterol Myth: Why Lowering Your Cholesterol Won't Prevent Heart Disease by Jonny Bowden and Dr. Stephen Sinatra The Truth About Statins: Risks and Alternatives to Cholesterol-Lowering Drugs by Dr. Barbara H. Roberts Cholesterol is not the Culprit, by Dr. Fred Kummerow Fat and Cholesterol Don't Cause Heart Attacks and Statins are Not The Solution by Paul J. Rosch MD (Author), Zoë Harcombe PhD (Author), Malcolm Kendrick MD (Author), & 18 more I don't want to start an argument between believers and non believers. I just want to know if the science behind the recommendation is good science and not manipulative statistical wrangling. Several authors claim that Lipitor's success claims are based not on 100 people taking the drug and 50 fewer dying, but 2 people out of 100 reaching some definition of success, where without the drug the success rate was 1 out of a hundred, and then in a twist of numbers any 6th grader should recognize, claiming this is a 100% increase in successful treatment. DOES THE MORTALITY rate improve with these drugs? [link] [comments]  |
| How do you measure the Earth's core temperature? Posted: 08 Dec 2016 04:40 PM PST I was just wondering how we estimate the Earth's interior temperatures. Obviously we can't get that far, how'd we come up with exact numbers? [link] [comments]  |
| Aluminium, copper, zinc coins + water + baking soda = a very nasty coating. Which metal reacted? Posted: 08 Dec 2016 07:53 PM PST I had several hundred one and five-yen coins in jar that, through condensation, got partly filled with water of the year. When I emptied the jar into the sink there was a kind of gunk surrounding the coins exposed to the water. I tried soaking and washing in soap but they were still stuck together and gunky. Oh a whim, I through a 1/2 cup of baking soda in and when I rinsed that gunk turned into a hard white crust. What happened? According to online sources, the 1 yen coins are pure aluminium and the five yen coins are a mix of copper and zinc. (Also, is there an easy way to clean that hard stuff off?) [link] [comments]  |
| Posted: 08 Dec 2016 06:33 AM PST |
| Posted: 08 Dec 2016 07:35 AM PST I know space travel is hazardous to astronauts due to long term exposure to "cosmic rays".... but what are they? Are they part of the electro-magnetic spectrum, like gamma rays? Also, I've read that they are difficult to shield against... but an insulating layer of water in a space ship's hull could provide protection... is that true? If so, why water and not another (less bulky) substance? Edit: Thanks, r/askscience! [link] [comments]  |
| Why do all burning things smell vaguely the same to us? Posted: 08 Dec 2016 10:18 AM PST I'm in a Starbucks and I smell something (<-- keyword) burning. Why do all burning things smell similar, and why are humans so good at identifying them? [link] [comments]  |
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