Interesting facts

I thought we could start a thread for sharing facts we love or find interesting/fun. Next time we're due to be in a social situation where it might be expected to share a fact as part of introducing ourselves, we can have this thread as a resource to look through so we have something ready. And at least as importantly I think, this can also be a space for info-dumping favourite facts about special interests. I'll start:

Parents
  • There is a type of (very tiny) frog called a glass frog which can make itself transparent when it sleeps. It does this by collecting the vast majority of its red blood cells into its liver, and expanding and contracting them at will to prevent clots. 

Reply
  • There is a type of (very tiny) frog called a glass frog which can make itself transparent when it sleeps. It does this by collecting the vast majority of its red blood cells into its liver, and expanding and contracting them at will to prevent clots. 

Children
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