-I wasn't ready to hear it then, but—I mean, probably not? So, for the _most_ part, all humans are extremely similar: as Yudkowsky would soon write about (following Leda Cosmides and John Tooby), [complex functional adaptations have to be species-universal in order to not get scrambled during meiosis](https://www.lesswrong.com/posts/Cyj6wQLW6SeF6aGLy/the-psychological-unity-of-humankind).
+I wasn't ready to hear it then, but—I mean, probably not? So, for the _most_ part, all humans are extremely similar: as Yudkowsky would soon write about [(following Leda Cosmides and John Tooby)](https://www.cep.ucsb.edu/papers/pfc92.pdf), [complex functional adaptations have to be species-universal in order to not get scrambled during meiosis](https://www.lesswrong.com/posts/Cyj6wQLW6SeF6aGLy/the-psychological-unity-of-humankind).