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I have a number of tools (things like wrenches and C-clamps) that have the words "Drop Forged" stamped on the handle. What does that mean?

I would like to donate blood and keep hearing about which blood types are needed most. How do human blood types work?

For 600 years, the Ottoman Empire covered a territory stretching across Europe and the Middle East, until it all came down after World War I.

George C. Parker was so successful he gave rise to the phrase, "And if you believe that, I have a bridge in Brooklyn to sell you."

When I get a headache, my friend presses a spot on my hand. Somehow, this makes my headache go away. How does this work?

The space race between NASA and the Soviet Union began with the Soviet's successful Sputnik I. Find out what played out during the space race.

Lithium-ion batteries are incredibly popular these days. You can find them in laptops, PDAs, cell phones and iPods. Find out why.

If my home's air filters are clean when I change them, are they really working? Find out the answer to this and learn more about air filters.

I'm always hearing people talk about pumping nitrous oxide into an engine. How does nitrous oxide help an engine perform better?

When I buy "20-pound bond paper," what part of it weighs 20 pounds? A ream certainly doesn't weigh 20 pounds.

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