Cations and Anions

Cations and Anions are concepts in chemistry. They are ions with a positive or negative charge. You can tell which is which in a few easy ways.

Cations - the t looks a little like a cross, or a plus sign! + cations are positive.

Anions - the common prefix "a" often stands for "without" or "against". Think of it as against a charge. -

Plural Octopus

I learned recently that I have been saying the plural of octopus incorrectly for many years. Apparently the word octopus originated from the Greek oktṓpous. The correct plural of this is octopodes; many incorrectly assume that the word is Latin, which would result in a plural of octopi. Currently most people accept octopi or octopuses as reasonable, especially as octopodes are rarely encountered, as the octopus is a mostly solitary creature. 

Image from: XKCD