Scientists debate meaning of 40-million-year-old primate fossils in Nature

Scientists debate meaning of 40-million-year-old primate fossils in Nature CHICAGO--Fossils recently discovered in Egypt fill one of the gaps in the evolutionary tree of primates and double the known age of one of its main branches. Because there are still so many gaps in the tree, statistical calculations push the origin of primates, including the earliest ancestors of humans, back to about 90 million years ago