Peter Thiel lost the most prestigious job in American law by one interview. A decade later, an old friend congratulated him on losing it. Out of tens of thousands of law grads each year, a few dozen land Supreme Court clerkships. Thiel interviewed with Justice Kennedy and Justice Scalia and got neither. He's written that at the time, he believed winning would set him up for life. His whole life had been that kind of track. A friend in his 8th grade yearbook predicted he'd end up at Stanford…