translation.en: Now we all have this feeling that we're somehow just getting better as a human race, inexorably progressing, but it's not like we've evolved into a new species in a century.
translation.zh: 现在我们都有一种感觉, 那就是我们作为人类 已有了无可争议的进步， 但这并不意味着我们在在一个世纪内 进化成了一个新的物种。