Octopuses' brains are donut shaped, with the hole in the middle being filled with their stomachs. That means if they overeat, they can get brain damage.

• ​​Bonus: "octopi" is not a word. Unlike other words with similar form (fungus-fungi), the plural form of octopus is "octopuses".​

Giraffes have the same number of vertebrae as us humans, they are just VERY large.​

Most Lego sets use pre-existing pieces ("Lego bricks") rather than have new ones designed. This makes for some pretty interesting hidden features. For example, the Lego Succulent set uses 6 guns as branches, and the Lego Bonsai Tree set uses elephant trunks as roots.

Sound travels faster through solid than through gas. This means if you put your ear against a VERY long table and knocked on it, the ear touching the table would hear the knock a split second before the other.

We simply don't know how smart cats are. When researchers try to test cats' intelligence, they refuse to comply. They don't respond to punishment or reward in measurable, expectable ways.

Bees have been recorded playing with miniature balls in laboratory settings. To test this, the researchers placed the bees in point A and their reward in point B, with the balls being in a third point, out of the way. Most bees in the experiment chose to take the detour to play with the balls.