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How do Sea Monkeys work?

animals.howstuffworks.com/marine-life/question191.htm

A friend of mine gave me a package of Sea Monkeys as a gag gift for my birthday. I grew them, and they look nothing like the package but they really are alive! What are these things?

How Much Fuel Does an International Plane Use for a Trip?

science.howstuffworks.com/transport/flight/modern/question192.htm

Although the amount of fuel may seem high, when you do the math, it's actually not so bad.

Would a balloon filled with vacuum instead of helium float?

science.howstuffworks.com/science-vs-myth/everyday-myths/question194.htm

A helium balloon rises because the helium is lighter than air. So how would a balloon -- made from a very sturdy but very lightweight material -- that had been removed of all air respond?

What does "Case Hardened" mean when it's stamped on a piece of metal?

home.howstuffworks.com/question196.htm

I have a lock that has the words "Case Hardened" stamped on it. I have seen this on lots of things made of metal. What does "Case Hardened" mean?

How Far Can the Human Eye See?

science.howstuffworks.com/question198.htm

Just how far can the human eye see? There's no exact formula to figuring it out, but we do have an idea.

How can I make my own battery to win a contest at school?

science.howstuffworks.com/question2.htm

I am entering a chemistry contest at my high school. The goal is to build the battery that produces the most watts for one minute. Our battery can't be bigger then 1 foot in any direction and can't use strong acids. What are the best chemicals to use, and what's the best design?

How does a car's rearview mirror work when it's in the glare-resistant setting?

auto.howstuffworks.com/question20.htm

How does a car's rearview mirror work when it's flipped upward in the glare-resistant setting?

If nature abhors a vacuum, then why doesn't the vacuum of space suck away all of the Earth's atmosphere?

science.howstuffworks.com/question200.htm

If "nature abhors a vacuum," then why doesn't the vacuum of space suck away all of the Earth's atmosphere?

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