The gorge of the Grand Canyon is 217 miles long. 56 of those miles are in the Grand Canyon National Park in Arizona. The canyon varies in width from 4 to 18 miles.
It takes 17 muscles in your face to smile, 43 to frown.
The skin on the foot or palm of your hand wrinkles when it is exposed at length to water because it expands.
An airplane’s black box is actually orange.
Chinese astronomers made the first recorded observation of Halley’s Comet in 240 B.C.
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