You can't help but notice that Scott Pitnick has a big tattoo. It's a sperm with a long tail that winds down his right arm.
People sometimes stare. "And when I tell them what it is, they either are very interested or they pivot on their heel and walk away," says Pitnick, an evolutionary biologist at Syracuse University. "All eye contact ceases."
Some people just don't like talking about sperm. But not him. He's spent his career trying to unravel the mystery of giant sperm.