n Chew on these popcorn stats: For kernels to pop, their moisture content must be between 13.5 and 14.5 percent. Also required for popping is a pressure of about 9 atmospheres, achieved by the moisture inside the kernels turning to steam when heated. Most commercial popcorn kernels expand to 30-40 times their original volume when popped.

In which of these venues are you most likely to see the letters ASDF?

A) At a baseball game

B) Under an automobile hood

C) At the office

D) On a food label

Tuesday’s answer: At the moment of the 1906 San Francisco earthquake, San Francisco was the largest U.S. city west of the Mississippi River, ranking No. 9 overall.