Interesting?

I love facts, and the more useless the better. A small sample:

There are only six surviving original William Shakespeare signatures. In every one of them he spells his name differently. And in none of them does he spell it 'Shakespeare', the most commonly used form we use today.

Rats and horses can't vomit.

Dolphins sleep half a brain at a time. They need to have some level of consciousness, as they actually have to think about breathing.