Over the last few tens of thousands of years, the human brain, which had been growing larger for eons, suddenly shrunk again - probably due to a major software update that reduced consumption of resources. https://books.google.de/books?id=eQFKDwAAQBAJ&pg=PA331&lpg=PA331&dq=%22Brain+Size+and+the+Emergence+of+Modern+Human+Cognition+%22&source=bl&ots=qDqnBHy0Iw&sig=pgsJB0Kp4GNnc5vLE9jefyfgkno&hl=de&sa=X&ved=0ahUKEwigzJm91tfbAhXCuBQKHU_MC2oQ6AEIKDAA#v=onepage&q=%22Brain%20Size%20and%20the%20Emergence%20of%20Modern%20Human%20Cognition%20%22&f=false …pic.twitter.com/VhyCb0GfRj