There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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Sound travels about 4 times faster in water than in air.
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Sony researchers have developed a refrigerator that only opens when you smile.
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The chills you sometimes feel when listening to music is called "musical frisson."
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Thinking in a foreign language makes decisions more rational.
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The Simpsons are yellow because creator Matt Groening thought it was a good way to catch channel surfer’s attention when they saw a flash of yellow.
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