The largest volcano known is on Mars: Olympus Mons, 370 miles wide and 79,000 feet high, is almost three times higher than Mount Everest.

A rainbow can be seen only in the morning or late afternoon. It can occur only when the sun is 40 degrees or less above the horizon.

You can be fined up to $1,000 for whistling on Sunday in Salt Lake City, Utah.

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