Just came across this interview with Nobel Prize winner Paul Samuelson by Conor Clarke at the Atlantic.
Samuelson is 94 years old now. And you get the sense he might go on for another century.
He gives his take on other luminaries Milton Friedman ("about as smart a guy as you'll meet. He's as persuasive as you hope not to meet") and Alan Greenspan ("the trouble is that he had been an Ayn Rander. You can take the boy out of the cult but you can't take the cult out of the boy.")
Also on the importance of drinking skim milk.