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Americans spend an estimated $250 million annually on air purifiers for their homes. Learn why people buy air purifiers and how they work.

Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides from power plants, cars and factories. Find out how acid rain is produced.

You may think you're skilled at 'multitasking,' but chances are you aren't working on two things at the same time. Learn more at HowStuffWorks.

If you love science and chemistry, you'll love taking this lab safety quiz, which contains 35 questions on lab procedures and safety protocols.

A Virgo born September 21, symbolized by the Scales, is quiet and personable. Learn about September 21 birthday astrology.

A Capricorn born January 4 is symbolized by the goat and has a quirky and sympathetic nature. Learn about January 4 birthday astrology.

A Scorpio born November 7, symbolized by the Scorpion, possesses intelligence and spirituality. Learn more about November 7 birthday astrology.

An Aquarius born on January 28 is symbolized by the Water Bearer and sees the analytical side of things. Learn about January 28 birthday astrology.

A Pisces born on March 9 is symbolized by the Fish and has a sensitive, genuine, truthful nature. Learn about March 9 birthday astrology.

A Leo born August 14 is symbolized by the Lion and has a perplexing and different personality. Learn about August 14 birthday astrology.

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