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Ever wonder how to volunteer at a soup kitchen? Visit HowStuffWorks to learn how to volunteer at a soup kitchen and why you should.

Mercury is the closest planet to the sun, and it's the smallest in the solar system. So why does it have longer days than we have on Earth?

Blocking incoming calls can prevent pushy salespeople and persistent telemarketers from reaching you. Why else are people blocking incoming calls?

A dying star can explode with the force of a few octillion nuclear bombs and create any element in the universe. But why do stars go supernova?

Why did the U.S. create Japanese internment camps during WWII? Read about the Japanese internment camps at HowStuffWorks.

Chimpanzee research dates back to the 1920s with Robert Yerkes. Learn what happens in chimpanzee research and why some countries ban the practice.

You use your keyboard every day, but did you know that even this simple device contains its own microprocessor? Learn why!

Herd immunity relies on the principle of safety in numbers as far as vaccinations go. Find out why herd immunity is an important public health issue.

Body dysmorphic disorder causes some people to obsess about their looks. Learn why body dysmorphic disorder affects your perceived appearance.

Referees and umpires make mistakes. But why do they always make them against our team? Here are 10 of the worst calls in sports history.

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