Scientists say that 6,000 years ago, humans dramatically . . . Scientists say that 6,000 years ago, humans dramatically changed how nature works and focused on 360,000 pairs of organisms in 80 plant or mammal communities on different continents, including
Slate: Why do we drink only cows milk? | Southeast Iowa . . . Walk down a dairy aisle and you may start to notice how little we've done with the whole concept Worldwide, there are about 6,000 mammal species, each with its own unique milk, but Americans get
The Rise and Reign of the Mammals: A New History, from the . . . The passing of the age of the dinosaurs allowed mammals to become ascendant But mammals have a much deeper history They – or, more precisely, we – originated around the same time as the dinosaurs, over 200 million years ago; mammal roots lie even further back, some 325 million years