translation.en: The field of paleoanthropology, I'll argue, gives us lots of fascinating possibilities about our ancestry, but it doesn't give us the probabilities that we really want as scientists.
translation.zh: 我得说，古生人类学 向我们提供了很多非常有价值的可能性， 但是没有给我们提供每种可能性的概率，那才是科学家们真正需要的。