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How do plants compare to solar cells when it comes to collecting solar energy?

science.howstuffworks.com/environmental/green-science/question638.htm

How do plants compare to solar cells when it comes to collecting solar energy? Would you get more power from an acre of ground by putting solar cells on it or by raising plants?

Why are some national contests invalid in certain states and other countries?

money.howstuffworks.com/question541.htm

Why are most national contests in the United States, void in Rhode Island? And what does "void where prohibited" mean? Also, why are these contests open only to U.S. (and sometimes Canadian) residents?

What Came First, the Chicken or the Egg?

science.howstuffworks.com/life/genetic/question85.htm

It's a chicken-or-egg situation: What came first? Perplexed people need wonder no longer, as we've sussed out the answer to this ancient riddle.

How many solar cells would I need in order to provide all of the electricity that my house needs?

home.howstuffworks.com/green-living/question418.htm

How many solar cells would I need in order to provide all of the electricity that my house needs? Learn more about solar cells and how they work.

What are copyrights and patents?

money.howstuffworks.com/question492.htm

What are copyrights and patents? Is there any difference or are they the same thing?

Where Do Bullets Go When Guns Are Fired Straight Up Into the Air?

science.howstuffworks.com/question281.htm

If you've ever watched a gun fired into the air at a celebration, you've probably wondered where that bullet ends up. We've got the answer.

Do certain radio wave frequencies (like those used by cell phones) pose health risks?

electronics.howstuffworks.com/question4.htm

Do certain radio wave frequencies pose health risks? If so, is it safe to live within a quarter mile of a cellular phone tower or a radio antenna?

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