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Our Most Difficult Knowledge Quiz
play.howstuffworks.com/quiz/our-most-difficult-knowledge-quiz
Stop yelling at the screen during "Jeopardy" and try a *real* killer knowledge quiz, smart guy! (Or smart gal). We'll put your brain through its paces, we promise!
How Fossils Work
science.howstuffworks.com/environmental/earth/geology/fossil.htm
Fossils can tell us how life on Earth has evolved over time and also how the climate has changed. Find out what fossils are and how fossils formed.
How Artificial Geothermal Energy Works
Artificial geothermal energy is made by adding water to naturally hot rocks. Learn about artificial geothermal energy.