Human Brain Shrinking
We often assume those with big brains are smarter while those with smaller brains are less intelligent. But that has proven to not be true. In fact, our ancestors had brains far larger than us. Yet many scientists believe the Neanderthals were relatively dumb creatures in our human evolution cycle. In the last 20,000 years, brains have been shrinking and our heads/skulls have shrunk along with them. Obviously, our skull protects our brain, so if the brain is not massive then the skull shouldn’t be either.