“There are two main lessons: One is that you can’t solve a political problem with an engineering solution. And [second] you can only engineer so many 9s on the end of 99.999% sure it’s going to be OK. When you’re trying to make guarantees about 10,000 years, it just doesn’t work. There’s always a hole in your theory. So, it’s actually better to come up with a series of century theories than to come up with one 10,000 year theory.”
