This week's Friday thread comes off of a great suggestion from MeanDean. What are some things that you heard/read about when you were a child that you completely didn't understand?

Here's Dean's example:
For example, when I heard news about the White House, I wondered which of the white houses I'd see as we drove around, they were talking about. I also remember news about the presidential "race" and I, being about 4, thought it was literally a footrace. When I heard a couple days later about the presidential race I was impressed they could still be running after all that time.