Rattling off snowfall amounts for various locations around your city is a staple of local news reports, and every so often you'll hear the reporter mention that the local airport saw a "trace" of snow. What exactly is a trace of snow, anyway?

"Lightning" is not the same as "lightening." The former is an electrical discharge from a thunderstorm. The latter is the descent of the uterus into the pelvis to line the baby up with the vagina at the end of a pregnancy.