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How the 'Alien' Xenomorph Works
entertainment.howstuffworks.com/alien-xenomorph.htm
You've always wondered how the xenomorph in 'Alien' worked. Now it's time to go behind the scenes and meet the xenomorph in 'Alien.'
How Evolution Works
science.howstuffworks.com/life/evolution/evolution.htm
Evolution is fascinating because it attempts to answer one of the most basic human questions: Where did life, and human beings, come from? The theory of evolution proposes that life and humans arose through a natural process.