Baby bears are born in the winter and stay inside their dens until spring. Every time a cub finishes nursing, the mom licks its bottom to make it urinate. The mother bear then drinks the urine, which helps keep the den clean.

In 1923, the first neon sign was introduced in the U.S. Two neon signs were sold to a Packard car dealership for $24,000 which read, "Packard."

Some kinds of frogs can be frozen solid then thawed, and continue living.

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