Why Do You Know That?

Let's pull this one back out. It's the converse of "auto mechanics to quantum mechanics," where the idea now is to contribute those bits of knowledge that seem really cool even if they are not directly applicable to anything.

My contribution:

Stan Freberg's son was the original voice of Linus on the Peanuts television specials.

Benjamin Franklin was an expert swimmer and invented an early version of flippers. He is the earliest American inducted into a sporting Hall of Fame having been inducted into the International Swimming Hall of Fame.

Jim Brown, one of the greatest running backs to ever play football, is not only in the Professional Football Hall of Fame and the College Football Hall of Fame, but also in the Lacrosse Hall of Fame for his career at Syracuse.

Your contribution? What do you know and why do you know it?