There's never going to be a decathlon that you're going to have 10 events that your satisfied with. You're always, always going to be dissatisfied in something, and that always draws you back to try to retry that the next time you do a decathlon. It's like you go for the perfect 10.
“The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.”