Why There Are No Denisovans or Any Other Species

The history of humanity is far more complex and fascinating than many people realize. Today, every person on Earth belongs to a single human species, Homo sapiens. Yet for most of our evolutionary history, we were not alone. The ancient world was home to a remarkable diversity of human relatives, including the Neanderthals, Denisovans, Homo erectus, Homo floresiensis, Homo naledi, and several othe...