Why does sunburnt skin remain hot to the touch even days after the burn has occurred?

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• Why does sunburnt skin remain hot to the touch even days after the burn has occurred?
• When we drain oil from wells. Does it make a empty pocket?
• How do spiders choose a location for their web?
• [Physics] How does gravity work on a torus world?
• If the ocean level was high enough, there would be zero coastline. If the ocean dried up completely, there would also be zero coastline. At what approximate ocean depth would there be maximum possible coastline?
• Why do UV stamps and UV paint show up under blacklight, but not under sunlight?
• Why is the imaginary number defined as i^2 = -1, rather than i = sqrt(-1)?
• What is this red line on the left side of the Sun?
• Does having AIDS reduce allergy symptoms?
• If an ant was the same size as a tiger, would still be able to lift 20 times its own weight?
• So if glass is made from sand, and sand is made from rocks, then how come we can see through glass but not rocks/sand?
• Why don't wireless phone chargers mess up the rest of the phone's circuitry?
• Why aren't man made satellites and the ISS destroyed by the Roche limit?
• What is the viability of personal spacecraft?
• Do other planets experience earthquakes too? If so, how do we know and how different are their magnitudes relative to Earth's?
• How does a down quark turn into an up quark in neutron decay?
• Why does the multiverse theory have an infinite number of universes?
• In what cases it would be more meaningful to take the harmonic average or the geometric average instead of the arithmetic average?
• If I woke up 3000 years ago, would it be realistically possible to create electricity in a usable form?
• Why does cold water feel, or seem to feel, so much colder than cold air? Why does 50°F water seem so much colder than 50°F air?

Why does sunburnt skin remain hot to the touch even days after the burn has occurred? Posted: 21 Jun 2017 04:13 PM PDT submitted by /u/gablerr [link] [comments]

When we drain oil from wells. Does it make a empty pocket? Posted: 21 Jun 2017 07:02 PM PDT submitted by /u/Erik5858 [link] [comments]

How do spiders choose a location for their web? Posted: 21 Jun 2017 07:09 PM PDT So this is a multi-part question, I suppose. First time posting here and asking you guys about something. Whenever it is that spiders are grown and ready to set up shop, spin a web and wait for dinner (the species that do hunt this way), how does it choose the location? How does it know where the ideal place is to collect food? How far do they travel to seek out such a place, if they do "seek" out certain places. Do they just drop a web whenever and wherever they are hungry? Move on when they get bored to a new place? Going through some things in the bottom of the closet, stuff that gets moved on occasion, a couple times a month maybe. Inside a shoebox (and similar places) there are usually some tiny, tiny spiders with their homes set up. Is there really a steady food supply in there, tucked away, door shut? Obviously I know there is tiny food for them galore, but really, in my closet? submitted by /u/supersayanssj3 [link] [comments]

[Physics] How does gravity work on a torus world? Posted: 22 Jun 2017 04:27 AM PDT Hey so I've been thinking about this for a while and would like a definitive answer. If I lived on a torus planet where the cross-section of the torus was the diameter of the earth and the hole in the middle of the torus was around the distance from the earth to the moon. Assuming the torus is not rotating so no artificial gravity. Where would gravity pull me towards? My slightly educated guess would be the center of mass of the torus. If this is the case then my follow up question would be, if gravity is weaker over distance, could I increase the size of this torus to the point where I would no longer be pulled to the centre? submitted by /u/HymirTheDarkOne [link] [comments]

If the ocean level was high enough, there would be zero coastline. If the ocean dried up completely, there would also be zero coastline. At what approximate ocean depth would there be maximum possible coastline? Posted: 21 Jun 2017 08:40 PM PDT submitted by /u/qwertzyu [link] [comments]

Why do UV stamps and UV paint show up under blacklight, but not under sunlight? Posted: 22 Jun 2017 07:06 AM PDT If the sun emits UV light, why can a blacklight with a UV bulb illuminate things that the sun can't? Is it just a question of strength or concentration of light waves? submitted by /u/danceswithlesbians [link] [comments]

Why is the imaginary number defined as i^2 = -1, rather than i = sqrt(-1)? Posted: 22 Jun 2017 04:47 AM PDT In case of i2 = -1, there are two possible outcomes for i. So why wouldn't you just define i? submitted by /u/JustReadingAndVoting [link] [comments]

What is this red line on the left side of the Sun? Posted: 22 Jun 2017 07:09 AM PDT https://beta3.helioviewer.org/?date=2015-06-14T14:48:26.000Z&imageScale=2.42044088&centerX=-240.22875734000002&centerY=-99.8431863&imageLayers=%5BSDO,AIA,304,1,100%5D&eventLayers=&eventLabels=true submitted by /u/Papa_John42 [link] [comments]

Does having AIDS reduce allergy symptoms? Posted: 21 Jun 2017 12:08 PM PDT I know that allergies are caused by your immune system targeting harmless molecules. I also know that AIDS destroys your immune system. Would having AIDS prevent your immune system from attacking harmless molecules? submitted by /u/lukego7 [link] [comments]

If an ant was the same size as a tiger, would still be able to lift 20 times its own weight? Posted: 21 Jun 2017 07:53 PM PDT submitted by /u/ThePainOfLoss [link] [comments]

So if glass is made from sand, and sand is made from rocks, then how come we can see through glass but not rocks/sand? Posted: 22 Jun 2017 04:15 AM PDT submitted by /u/tiggerjb222 [link] [comments]

Why don't wireless phone chargers mess up the rest of the phone's circuitry? Posted: 21 Jun 2017 06:31 PM PDT I understand Gauss's law and the inductive charging process but I don't get why that doesn't make the rest of the phone go berserk. submitted by /u/shaneahc [link] [comments]

Why aren't man made satellites and the ISS destroyed by the Roche limit? Posted: 22 Jun 2017 01:47 AM PDT submitted by /u/shareink123 [link] [comments]

What is the viability of personal spacecraft? Posted: 22 Jun 2017 12:56 AM PDT And what things would such a craft need to account for short trips in space, say to the moon? submitted by /u/Iconoclast_DotA [link] [comments]

Do other planets experience earthquakes too? If so, how do we know and how different are their magnitudes relative to Earth's? Posted: 21 Jun 2017 11:01 PM PDT If they don't have earthquakes, then why not? submitted by /u/BenjiBubbles [link] [comments]

How does a down quark turn into an up quark in neutron decay? Posted: 21 Jun 2017 11:53 PM PDT I had thought that an electron was a quark-antiquark pair, but apparently this isn't so. So neutron decay starts with a neutron (udd), and in the end, there's a proton (uud) and two leptons. Are up and down quarks, then, not fundamentally different things? Are 'upness' and 'downness' just different quantum states of something quarky? submitted by /u/SurprisedPotato [link] [comments]

Why does the multiverse theory have an infinite number of universes? Posted: 21 Jun 2017 12:27 PM PDT Every time I see the multiverse theory mentioned on TV, movies, books, comics, etc. they have the same basic concept of infinite universes, some very like ours, some very different. While the idea that there are different universes with different laws of physics sits fine with me, the concept of there being one universe exactly like mine but I'm made of corn, in another the only difference is I have a different colour shirt on, etc. seems ridiculous. Why does the theory have 'infinite' rather than many universes? submitted by /u/PermanentSubstitute [link] [comments]

In what cases it would be more meaningful to take the harmonic average or the geometric average instead of the arithmetic average? Posted: 21 Jun 2017 03:43 PM PDT submitted by /u/sourc3original [link] [comments]

If I woke up 3000 years ago, would it be realistically possible to create electricity in a usable form? Posted: 21 Jun 2017 12:18 PM PDT I frequently have dreams where I wake up in the past and am completely useless, and so I'm wondering if it would actually be possible to create modern technology without any support structure in place. I know the basics for creating electricity: A magnet, some conductive wire, and something for the electricity to work on, but would it be possible to create a powerful enough magnet from scratch? How would I go about making copper wire before copper wire is a thing? Could I create my own light bulb? submitted by /u/RadBadTad [link] [comments]

Why does cold water feel, or seem to feel, so much colder than cold air? Why does 50°F water seem so much colder than 50°F air? Posted: 21 Jun 2017 12:29 PM PDT I can walk outside in a pair of shorts and a t-shirt when its 50°F outside just fine, but when I get in 50°F water, I feel like I'm going to die. Thanks gang. submitted by /u/Norskee0 [link] [comments]

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