[Repeating the <a href="http://www.snopes.com/science/stats/10percnt.htm" target="_blank">10% brain use myth</a>]If we were designed to live 900 years, one would expect to find unexplainable anomalies in our understanding of the human body, becase we're only seeing a small snapshot of what the body was designed to do or handle. And that is exactly the case. As it turns out, we only use a fraction of the memory capabilities of our brains. If we lived to 900 years or more, we would use most of the remainder. Obviously our brains were designed for longer lives.