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Research has shown that frequently cracking your knuckles increases your chance of hand swelling and lowered grip strength.

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The average ant has about 250,000 brain cells; a human has about 10 billion. It takes 40,000 ants to equal the brain of a human.

A dolphin's flipper is made up of five distinct bone structures, similar to that of a human hand.

The human body cannot produce vitamin C, an essential nutrient.

The human body cannot produce vitamin C, an essential nutrient. To ensure adequate levels of vitamin C it must be consumed daily.

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The human sneeze can travel faster than 100 miles per hour (160 km/h). It is not recommended to hold back a sneeze, as the extreme pressure may cause ear damage.

Between 30,000 and 40,000 skin cells fall off you every minute as new cells grow and take their place. Your outer skin layer will be completely replaced by new cells in one to two months.

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