Today we practiced in naming.playground file. People who are new to programming sometimes think that coding is mostly about using numbers. Programmers actually spend much more time thinking about names. A programmer who sees an expression like 4 + 5 is usually more interested in what the 4 and 5 mean (are they minutes? marbles? grapefruits?) than that they add up to 9. Becoming skilled at naming will make you a much better programmer.