(retro)photo Friday #7: Kids invent everything.

A bunch of neighborhood kids were at the top of a steep, snow-covered incline, arguing over who had the idea to stand up on his sled and use it as a makeshift snowboard. Each boy insisted he had been first to come up with the brilliant new sport, a solution to the too-many-kids-not-enough-snowboards conundrum.

When I was seven, I also thought I was the first person to stand up on my sled. I called it "snurfing."

The great narcissism of youth convinces you that you're the first person ever to...