The average human brain size is growing — but that doesn’t exactly mean we’re smarter

Humans owe our impressive intellect to our large brains, which are unusually sophisticated thanks to evolution. The first surge in our brain size occurred between 2 million and 800,000 years ago, when our species’ increase in territory and physical size caused our brains to literally grow. As the climate changed between 800,000 and 200,000 years ago, human brains became even more complex so people could adapt to their new environments....

Originally posted on salon.com