A validation code—also known as a CVV, CV2, or CVV2 code—is a series of three or four numbers located on the front or back of a credit card.

This little web app colors text so that each part of speech is a different hue—just like text editors that highlight the syntax of different coding languages.

Researchers often find themselves coding algorithms in one programming language, only to have to rewrite them in a faster one. An up-and-coming language could be the answer.