Well, it is like this. The larger the initial population, the greater the probability that long streaks of some favourable outcome will appear purely by change.

Well, it is like this. The larger the initial population, the greater the probability that long streaks of some favourable outcome will appear purely by change. So if I see a single monkey throw a die that consistently lands on 6, I might be inclined to reason that something special is going on with the die, or the monkey his throwing. But if I let a billion monkeys throw a die repeatedly, the probability of having long streaks of consecutive '6-es' from a random monkey, is virtually 1, by randomness alone. Monkey's with streaks you then select out of the initial billion, the rest you discard and then you write about how all hot throwing monkeys like bananas.