A bunch of random stuff I know that isn't substantial enough to get its own page.
We don't know whether the first language was spoken or signed
The symbol for the letter 'A' is an upside-down ox's head. It can be traced back to the first letter of the Phoenician alphabet, aleph.
Snakes have two penises, and just like how we can have a dominant hand, they can have a dominant penis.
Our sensitivity to blue light goes all the way back to our ocean ancestors. These animals' eyesight developed in blue light as the water filters shorter wavelengths of light like red and yellow, and blue is left over.
Water expands as it freezes because ice's crystal structure has more gaps between molecules than water does as a liquid.
The type O blood type was supposed to be called type zero, but it was misread when written down.
The number zero used to be called 'cipher'.
In the German tradition, the letter labelling of musical notes went up to 'h'. This meant that Bach could spell his name in notes, which he actually did, using B-A-C-H as a motif in some of his music.
The optic nerves route optical data to the limbic system as well as the conscious mind, so some blind people can respond to facial expressions without seeing them. They can even catch yawns this way.
A medium-sized cumulus (Cumulus Mediocris) cloud can weigh as much as 80 elephants.
The BIC biro was patented in 1938.
The platypus experiences more REM sleep than any other mammal (~14 hours a day).
Domesticated corn (as in the type we grow for food) cannot survive without human aid as it can't naturally reproduce.
Pigeons were the first domesticated bird.
Morphine was named after Morpheus, a Greek god of sleep and dreams.
You can tell the age of a horse from its teeth. This is what the phrase 'don't look a gift horse in the mouth' is referring to (basically, 'don't question the value of a gift').