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Skyquakes have been heard in the U.S. and all over the world. HowStuffWorks looks into the mystery.

Guilty of buying books you never have time to read? We get it. And there's a name for that.

Screws come in a variety of shapes and have a variety of purposes. Learn about pan-head machine screws in this article.

Botanicals have been receiving a lot of press lately, but they can be dangerous. Learn about the safety of botanicals for seniors.

Macaws mate for life, can speak human words and have even been known to blush when delighted.

Sea spiders don't do anything by the book, and researchers have just gotten to the bottom of how they breathe.

Have questions about surrogacy? Get answers to 5 questions you were afraid to ask about surrogacy.

Do animals laugh? Researchers have investigated whether animals are capable of making a unique sound in response to joy.

Celeron and Pentium chips have a lot in common, but there are some features that separate them. Which one is right for you?

Is that batch of bug spray you have left from last summer still effective? If it is, for how long?

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