It is a cardinal sin to bore the reader.
The human species really could have faced global thermonuclear war. During seventy years of Cold War we grew used to it.
We're looking as far ahead as we can, and we don't get penalized for mistakes.
Everything starts as somebody's daydream.
Mother Nature doesn't care if you're having fun.
I never got good at predicting what millions of people will suddenly decide is rational.