When did the Neolithic Revolution occur?
Liz D is right as to the time–10,000 or so years ago. We know about it by finding human remains and places where humans lived in those days and trying to analyze their teeth and the remains of food, etc. to get an idea of their diets. Neolithic people began to farm and domesticate animals so if we find domesticated cereals and sheep bones with their bones instead of nuts and berries and bones of wild animals, then we can theorize that they knew how to farm and had domesticated animals. And we can get the date by carbon 14 tests of human and plant remains as well as other means, such as the layers in the soil where the remains were discovered.