This 16 October 2018 video says about itself:
Purgatorius, a kind of mammal called a plesiadapiform, might’ve been one of your earliest ancestors. But how did we get from a mouse-sized creature that looked more like a squirrel than a monkey — to you, a member of Homo sapiens?
Scientists look to fossils and evolutionary trees to help determine the rate of evolution — albeit with conflicting results. A new model has helped to resolve these contradictions: here.
MicroCT scans of the Australopithecus fossil known as Little Foot shows that the brain of this ancient human relative was small and shows features that are similar to our own brain and others that are closer to our ancestor shared with living chimpanzees: here.