Why does a wound itch before it's healed? | AskScience Blog

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Monday, May 14, 2018

Why does a wound itch before it's healed?

Why does a wound itch before it's healed?


Why does a wound itch before it's healed?

Posted: 13 May 2018 07:09 PM PDT

Do bees ever fight over a single flower?

Posted: 13 May 2018 06:08 PM PDT

How would an AI be affected if humans decided to lie to it during learning?

Posted: 14 May 2018 05:18 AM PDT

I had this thought, as if for example Facebook asks for your opinion on an action taken (Which could later be used or is currently used to train AI's) And instead of clicking the smile/happy emoji option i chose the angry/sad emoji option. Could that make the AI useless thus delay it's development, break it completely or make it destructive?

submitted by /u/Sikator
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Physics When two EM waves are in destructive interference, where does the energy go to?

Posted: 14 May 2018 05:25 AM PDT

Basic example I can think is in a Mach-Zehder interferometer. If the two wave fronts that collide are in destructive interference, they "cancel out".

I never understood what this really means. Mathematically it is quite obvious, but in the physical world, the energy has to go somewhere.

submitted by /u/MadameBanaan
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What happens when two or multiple sperm fertilize a single egg simultaneously?

Posted: 14 May 2018 04:12 AM PDT

I know fraternal twins occur when two separate eggs are fertilized and identically twins occur when a single egg splits, but would this scenario cause a birth defect or a failed pregnancy or something else?

submitted by /u/sloposaurus
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Does Saturn's largest moon Titan really has "Methane Lakes"?

Posted: 14 May 2018 05:13 AM PDT

My dad explained to me that day about Saturn's largest moon Titan. The only moon with a planet-like atmosphere. My dad also told me that that moon has petroleum lakes which space.com calls "methane lakes". Is this true and is there a possibility of a living organism there?

submitted by /u/muthanii
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Could we accelerate decay of say U235 using a linear accelerator?

Posted: 14 May 2018 05:04 AM PDT

Why do microwaves cook/heat things faster than ovens, when ovens reach higher temperatures?

Posted: 13 May 2018 06:18 PM PDT

e.g stick a Hot Pocket in the microwave and you're good to go in about 2 1/2 minutes, but put it in the oven, and it takes about 10-15. According to the box, anyway.

submitted by /u/NeuroSama
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Do insects get sick? like do ants get colds or do bees get STI's?

Posted: 13 May 2018 11:04 AM PDT

If space was filled with air, would we be able to hear our sun?

Posted: 13 May 2018 08:42 AM PDT

Hey, I just watched this video, in which Chris Hadfield debunked some myths about space and beeing an astronaut.

At 4:37 he mentioned, that we aren't able to hear the sun, because there's no medium which can transfer the sound to earth.

But If there was one (air eg), would we be able to hear it and if so, how loud would it be?

submitted by /u/Ente69
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How was the relationship between Pascal's tiangle and the binomial theorem discovered?

Posted: 13 May 2018 03:47 PM PDT

I was reading the history of Pascal´´´'s triangle and I noticed it's history goes as far as the 2nd century as a math/logical experiment. So I was wondering if the understanding of the Pascal triangle had something to do with the understanding of the binomial theorem, or the relationship arises from a coincidence.

submitted by /u/ullyses85
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Do other languages have a preferred way to order adjectives?

Posted: 13 May 2018 03:21 PM PDT

I learned recently that in English we typically order adjectives opinion-size-physical quality-shape-age-colour-origin-material-type-purpose, and would like to learn more about it. Has it always been like this? Is it like this in other cultures? Are there theories as to why this developed?

submitted by /u/MoreGeneral
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Producing gold with antimatter?

Posted: 14 May 2018 05:16 AM PDT

If i shoot a mercury atom with an antihydrogen atom would it just anhiliate one proton and one electron and create gold? Only theoretically haha

submitted by /u/mdmax123
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How do therapists treat antisocial personality disorder?

Posted: 13 May 2018 08:22 PM PDT

This includes medications and therapy depending on if the patient is born with it or acquired it

submitted by /u/Scarab3000
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How are potential energy and entropy related?

Posted: 14 May 2018 04:47 AM PDT

There seem to be two basic laws governing most (conservative in the physics sense - let's ignore cases where the potential doesn't exist) systems:

  • In the long run, things "roll downhill" from high potential to low. Physics even formalizes this idea, since the force field F is the negative gradient of the potential field by definition provided F is conservative.

  • Energy tends to disperse, i.e., the second law of thermodynamics.

Is there a relationship between these two? In particular, is there a reason that high potential seems to correspond to low entropy?

When I play with the idea, I seem to get conflicting results:

  • The classical heat engine, with a hot reservoir and a cold one, doesn't seem to be extracting potential energy - it's extracting the kinetic energy of the motion of the molecules. But it is a thermodynamically irreversible process, so entropy is increasing. This seems to argue against a connection.

  • A ball bearing on the head of a pin is at a maximum of potential among stable states, and at a minimum of entropy since there is only one microstate corresponding to this macrostate. When perturbed, it seems like entropy rises, since the broken symmetry of the system should require an extra parameter to describe (namely, which direction the bearing fell) and because there are now many possible microstates corresponding to the "bearing has fallen off the pin" macrostate. Potential falls, of course, since the bearing is dropping. So this would seem to argue for a connection.

  • A ball bouncing elastically on the floor has oscillating potential, although it tends to decrease over time as the ball's bounces go less and less high. But this is a spontaneous process, and the elasticity of the bounces means entropy increases. This argues against a connection.

So what gives? How can both "force pulls towards lower potential" and "entropy increases" be physical laws if they seem to give contradictory answers? Or maybe more succinctly: how can thermodynamics and mechanics play nice?

submitted by /u/Chel_of_the_sea
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Does the human body actually consume water or is it just stored, used, and expelled?

Posted: 13 May 2018 03:45 PM PDT

Are there any processes in the human body that actually consume the water? As in if I drink 32 ounces of water, would I then expel 32 ounces over the next X-hours or would it be a lower amount? Thanks!

submitted by /u/Blargasaur
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What is the highest level of oxygen that a human can safely live in?

Posted: 13 May 2018 04:50 PM PDT

I know that our earth's atmosphere is about 21 percent, but what is the highest percentage of oxygen in which humans can safely live?

submitted by /u/nickmavrick
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Why does all garbage basically smell the same, even though its components can vary widely?

Posted: 13 May 2018 06:04 PM PDT

Can an animals be gay?

Posted: 13 May 2018 07:24 PM PDT

Edit-ignore the 's' in front of animal

submitted by /u/M33RHARIS
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Question about mountains and the behavior of hurricanes?

Posted: 13 May 2018 04:52 PM PDT

I have heard that the elevation of Mauna Kea (13,000) and Mauna Loa (13,000) on the Big Island as well as Haleakala (10,000)on Maui actually obstructs approaching hurricanes and causes them to veer from hitting Maui and the Big Island. Is there any truth to this?

submitted by /u/cakenoodle
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What is the cutoff point for the number of atoms or molecules needed to declare their state of matter?

Posted: 13 May 2018 10:32 AM PDT

For example, how many water molecules must there be in a chamber to declare them a gas? At what point can you declare them a liquid? Solid?

submitted by /u/NeodymiumCandy
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Do meteors enter our atmosphere all the time or no?

Posted: 13 May 2018 08:13 PM PDT

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