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How Alchemy Paved the Way for Chemistry

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Alchemy may seem like a cousin to witchcraft but in reality it was the forerunner of modern chemistry.

How Alcoholism Works

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Alcoholism can be difficult to spot. Learn the difference between heavy drinking and alcoholism, how alcohol affects the body, what factors may lead to alcoholism and what treatments are available for this addiction.

How Algae Biodiesel Works

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Many people are interested in algae biodiesel as a green fuel. Learn all about algae biodiesel and how researchers make biodiesel from algae.

How Alien Hand Syndrome Works

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Alien hand syndrome sounds like something from a B-grade horror movie, but it's a real condition. You could be completely at the mercy of your own renegade hand -- it could keep your other hand from functioning, punch you or even choke you.

How Aliens Work

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Alien life forms would probably differ from those on Earth but still adhere to certain principles. Learn about astrobiology and the search for alien life forms.

How Aluminum Works

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Aluminum is used in many products, from pots and pans to light bulbs and power lines. Learn how aluminum went undiscovered for so long.

How Amnesia Works

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Memory is your only personal record of the past and of who you are as an individual. What if you woke up one morning and your memory was gone?

How Anesthesia Works

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Anesthesia is used in surgeries as a method of minimizing pain during the procedure. Learn about anesthesia and the different types of anesthesia.

How Anger Works

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We've all felt fury wash over us. Whether it's the guy who blurts the score to the game you TiVo'ed or the woman who lets the door slam in your face, anger is universal. You might as well learn how it works.

How Animal Testing Works

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Animal testing has a long, gruesome history, but it's also saved countless human lives.