Human Ancestors May Have Interbred With Chimps

Today's The Washington Post has piece on a new theory which claims that chimps and humans shared a common apelike ancestor much more recently than was thought. Furthermore, when the two emerging species split from each other, it was not a clean break. Some members of the two groups seem to have interbred about 1.2 million years after they first diverged -- before going their separate ways for good.