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Why do some people on Ambien eat in their sleep?
science.howstuffworks.com/life/inside-the-mind/human-brain/ambien-eat.htm
Ambien, one of the top-prescribed sleeping pills, may cause some people to eat in their sleep. See why Ambien makes some people hungry late night.
Why do those long, white clouds form behind jets flying high overhead?
science.howstuffworks.com/transport/flight/modern/question195.htm
Contrails are those long white clouds that form in the wake of an airplane flying at altitude. What causes these contrails and what are they made of? Learn the answer to this question in this article from HowStuffWorks.
Why do we kill?
science.howstuffworks.com/life/inside-the-mind/emotions/why-do-we-kill.htm
Why do we kill? There's no doubt that humans are a violent species. Find out why we kill and what makes people more inclined to kill.
Why do you have to turn your phone on at airport security?
Going through airport security is the worst part of flying for most people. Now you may be asked to turn your cell phone on in the security line. Why do you have to do that? And does it really keep us safe?
Why does Alka Seltzer fizz?
science.howstuffworks.com/innovation/science-questions/question116.htm
Yesterday you talked about hydrogen peroxide, and the day before you talked about Pop Rocks candy. Since we are talking about things that fizz, what about Alka Seltzer? How does it work and why does it fizz?
Why does beer form a head but soda doesn't?
science.howstuffworks.com/innovation/edible-innovations/beer-form-head-not-soda.htm
A quickly poured beer or soda can create a layer of foam -- also known as a "head" -- toward the top of the glass. But while a soda head rapidly disappears, a beer head lingers even after you've begun to drink the beer. How can this be possible?
Why does smoke come from a fire?
science.howstuffworks.com/environmental/energy/question43.htm
Let's say you have a nice fire going, and it's reduced down to a pit of hot "glowing embers." If you now toss a piece of wood, or even a sheet of paper, onto this fire, you see a huge puff of smoke as it heats up.
Why doesn't tear-free shampoo sting your eyes?
science.howstuffworks.com/science-vs-myth/everyday-myths/tear-free-shampoo-not-sting-eyes.htm
Some say the real reason "no tear" shampoo works is that it has Novocain in it, desensitizing babies to its sting. Fact or urban legend?
Why don't water towers freeze solid in the winter?
science.howstuffworks.com/engineering/structural/water-tower-freeze.htm
Does a water tower freeze in the winter? Learn about water towers in this article.
Why is Uranium-235 ideal for nuclear power?
Nuclear plants provide the world with much of its electricity. Learn why Uranium-235 is ideal for nuclear power, in this article.