Think of the last time you had to show some proof of your identity. Maybe you used your library card to check out books, or you used your student ID to get discounted tickets, or you showed your driver’s license to gain admission to a concert. Most adults have some form of proof that we are who we say we are. But if you don’t have any physical proof, how can you convince people of your identity?

I read a story this week that made me think about this question. Johnny Weissmuller was a 5-time Olympic gold medalist who starred in 38 movies and TV series from 1929 to 1976. He is best known as the original Tarzan. He starred in 12 Tarzan movies from 1932-1946. He’s the one who came up with that famous move where he beats his fists on his chest and shouts this loud cross between a yodel and a s…