The South American degu, a small rodent, uses urine to mark its passageways. Its urine reflects ultraviolet light, which the degu can see.

The Pentagon cost $49,600,000 to build in 1941.

The word "limelight" that is used in theatre to refer to the performers on the stage originated because before electricity was available lime was burned in a lamp, which created a white light that was directed at the performers.

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