A teratoma is a tumor made up of several different types of tissue, including hair, muscle, teeth, or bone. They typically form in ovaries, testicles, or your tailbone. – WTF Fun Facts
Source: Definition of teratoma – NCI Dictionary of Cancer Terms – National Cancer Institute
The word muscle comes from the Latin musculus meaning little mouse. So called because the shape and movement of some muscles (notably biceps) were thought to resemble mice under cloth. – WTF Fun Facts
What does the word Camaro mean? according to GM – WTF fun facts