In theory, an earthquake can actually measure 11, or even higher. The formula for the Richter scale has no upper limit.

Related Fact: Speaking of Charles Richter, the American scientist was supposedly an avid nudist. Rumors persist that his wife was so distressed by his penchant for hanging out in the buff that she divorced him.

[Source: "13 Essential Talking Points for the Earthquake Enthusiast." See previous Numbers of the Day here.]