Nerve impulses for muscle position travel at a speed of up to 390 feet per second.

In 1693, the postage rate of a letter was determined by how much light went through the letter. The less the light went through the letter the more expensive the rate would be. This technique was referred to as candling.

The crack of a whip is actually a tiny sonic boom, since the tip breaks the sound barrier.

AMAZING FACTS

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