THE KNOWLEDGE FEED

5 Questions: The Rain in Spain

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5 Questions: They're Full of Beans, Baby

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5 Questions: Sultans of Swing

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Amazingly, blue whales can slow their heart rate to four or five beats per minute in order to conserve oxygen during deep dives.

Amazingly, blue whales can slow their heart rate to four or five beats per minute in order to conserve oxygen during deep dives.

The male giraffe determines a female's fertility by tasting her urine. If it passes the taste test, the courtship continues.

The male giraffe determines a female's fertility by tasting her urine. If it passes the taste test, the courtship continues.

5 Questions: Brush Up Your Shakespeare

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5 Questions: "FREE" ANSWERS

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The infinity sign is properly known as a "lemniscate."

The infinity sign is properly known as a "lemniscate."

5 Questions: Add-a-Letter: V to Volta

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5 Questions: HAIR APPARENT

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5 Questions: Mars Needs Trivia

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5 Questions: Dodge Cars III

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A ten-gallon hat actually holds a little less than one gallon of water.

A ten-gallon hat actually holds a little less than one gallon of water.

5 Questions: I DON'T LIKE MONDAYS

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In addition to his work in atomic theory and physics, Albert Einstein helped patent several refrigerator designs, though none of them proved successful.

In addition to his work in atomic theory and physics, Albert Einstein helped patent several refrigerator designs, though none of them proved successful.

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