Neanderthals??? Do your research!
"There???s a chance the human brain could start to conserve energy and bring us back towards the size of the noggins of our Neanderthal ancestors"
1. The Neanderthals were not our ancestors, but either a sub-species of homo sapiens (Homo sapiens neanderthalensis) or a closely related human species (Homo neanderthalensis).
2. At birth, the Neaderthal cranial capacity was the same as modern humans, and as adults the Neanderthals had a larger cranial capacity than modern humans.