Why do skydivers have a greater terminal velocity when wearing lead weight belts?

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• Why do skydivers have a greater terminal velocity when wearing lead weight belts?
• How close to a perfect sphere is a black hole?
• [Physics] What type of detector would be needed to verify or disprove the existence of the gravitational wave background?
• What would be the cheapest or easiest elements to artificially make using nuclear reactions?
• How do contemporary mathematicians compare to Euler?
• [Earth & Planetary Sciences] Why does climate change seem to affect Earth's poles much more than it does areas closer to the equator?
• When you take a drug (say caffeine) for a while and the receptors for that drug get 'down-regulated' what actually physically happens?
• How did people determine that "PEMDAS" is the correct order for solving math problems and who was that person/persons?
• Why are the bubbles in a Windex bottle not circular?
• What would happen if you cooled hydrogen atoms and neutrons to near absolute zero and collided them? Would it kickstart a fusion reaction? Would it be worth the effort?
• What causes magnetism in non-magnets?

Why do skydivers have a greater terminal velocity when wearing lead weight belts? Posted: 24 Dec 2016 08:02 AM PST My brother and I have to wear lead to keep up with heavier people. Does this agree with Galileo's findings? submitted by /u/10-46 [link] [comments]

How close to a perfect sphere is a black hole? Posted: 24 Dec 2016 08:26 AM PST Is there much variation in the surface of a black hole? I'd imagine because of its relatively small size and huge mass black holes would be very close to a perfect sphere. submitted by /u/mbeaumont1 [link] [comments]

[Physics] What type of detector would be needed to verify or disprove the existence of the gravitational wave background? Posted: 24 Dec 2016 08:04 AM PST The gravitational wave background is conjectured to exist and is similar to the cosmic microwave background radiation, but instead of light, it is gravitational waves. As light from the first quarter million years of the universe could not penetrate the plasma soup at the time, the CMBR is limited to showing us the universe after that time - the gravitational wave background might enable us to probe earlier than that. submitted by /u/sirgog [link] [comments]

What would be the cheapest or easiest elements to artificially make using nuclear reactions? Posted: 24 Dec 2016 11:09 AM PST I don't mean purifying an element from compounds, I mean making an element from different elements. Californium is outrageously expensive and difficult to produce, but is it easier to make lead? I understand that alpha particles or helium ions are produced spontaneously from some heavier radioactive elements, but don't know how expensive or difficult to get those starting materials. Wiki tells me alpha particles/helium can be made in cyclotrons, but I assume making one would have high costs, as would electricity. I don't intend to ACTUALLY do it, just kid's question got me curious what the lowest price tag on alchemy would be. submitted by /u/interkin3tic [link] [comments]

How do contemporary mathematicians compare to Euler? Posted: 24 Dec 2016 07:31 AM PST The more I learn about Leonhard Euler, the more I am amazed by how much he was ahead of everyone else of his time. Since the 18th century mathematics has advanced considerably, but I am wondering whether the mathematicians of today come close to Euler's genius? submitted by /u/magsr [link] [comments]

[Earth & Planetary Sciences] Why does climate change seem to affect Earth's poles much more than it does areas closer to the equator? Posted: 24 Dec 2016 12:02 PM PST submitted by /u/FromTheDeskOfJAW [link] [comments]

When you take a drug (say caffeine) for a while and the receptors for that drug get 'down-regulated' what actually physically happens? Posted: 24 Dec 2016 11:47 AM PST Do the receptor sites disappear or get destroyed? Do the receptor sites simply stay there but withdraw into the cell wall? Do the receptors get plugged up with a molecule irreversibly binding to it? submitted by /u/neutronboy [link] [comments]

How did people determine that "PEMDAS" is the correct order for solving math problems and who was that person/persons? Posted: 24 Dec 2016 06:21 AM PST EDIT: Not remotely a math person myself. You guys are awesome. Thanks for the help! submitted by /u/Vat1canCame0s [link] [comments]

Why are the bubbles in a Windex bottle not circular? Posted: 24 Dec 2016 12:15 PM PST submitted by /u/seebs [link] [comments]

What would happen if you cooled hydrogen atoms and neutrons to near absolute zero and collided them? Would it kickstart a fusion reaction? Would it be worth the effort? Posted: 23 Dec 2016 07:06 PM PST submitted by /u/questiont1m3x [link] [comments]

What causes magnetism in non-magnets? Posted: 23 Dec 2016 09:41 PM PST I was playing with two butter knives and then suddenly realized that when placed next to each other that they were weakly magnetic. I can't think of anything that I did that can create the magnetic field without an existing magnetic or electric field. submitted by /u/-ManBearPig [link] [comments]

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