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

The seventeenth president of the United States, Andrew Johnson did not know how to read until he was 17 years old.

Pretzel snacks have been around for over 1300 years. A European monk invented the snack using used leftover bread dough.

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