The human brain is the most sensitive and delicate organ in your body, which explains why it is protected by the thick-boned skull and three very tough vertebrae. It’s all the more surprising to learn that this squishy mass can survive the most time from decay of any organ. In a new study, researchers at the University of Oxford have cataloged over 4,400 naturally preserved human brains, some as old as 12,000 years. This archaeological archive includes the brains of Inca sacrificial victims, prehistoric people, and even North Pole explorers. “Since the mid-17th century, more than 4,400 human b…