Today In - 'Useless Info'

"Long in the tooth," meaning "old," was originally used to describe horses. As horses age, their gums recede, giving the impression that their teeth are growing. The longer the teeth look, the older the horse.

The phrase "raining cats and dogs" originated in 17th Century England. During heavy downpours of rain, many of these poor animals unfortunately drowned and their bodies would be seen floating in the rain torrents that raced through the streets. The situation gave the appearance that it had literally rained "cats and dogs" and led to the current expression.