Dr. Sandra Lee popped by the Mental Floss offices to define everything from whiteheads and blackheads to two types of cysts.

WORDS
Here's how to stick to your New Year's Resolution.
The creator once estimated it should take "around two years" to complete.
According to some estimates, 30 percent of the English language—or roughly one in three English words—is derived directly from French.
Every time Christmas rolls around it brings with it its own vocabulary of words you barely hear the rest of the year. Here are a few we should bring back.
The first edition featured 39 pages on horse diseases.
If you're looking for a new nickname for your sweetheart, try hasenfürzchen. (Just don't tell them it means "bunny fart" in German.)
The game of hopscotch has nothing to do with little kids skipping over glasses of Johnnie Walker. What is going on?