There definitely is. I'm not sure if that was the case with Feynman, but he sure did produce some great work during this era. I used to be like that when I was

There definitely is. I'm not sure if that was the case with Feynman, but he sure did produce some great work during this era. I used to be like that when I was in my 20s, but as I get older if I get depressed it significantly reduces my productivity.