Scientists have announced the discovery of some interesting genetic patterns between ourselves and our closest living cousins, the chimps and bonobos. While the discovery that some bonobo and chimp genes are more closely related to us than they are to each other is all well and good, if I read this book correctly, it doesn't necessarily mean interbreeding. I can't recall the details just from memory, but there are definitely simple inheritance patterns which could lead to such a thing without needing a bunch of semi-sentient primates boinking each other every chance they get. Sort of thing.