The human brain power uses up more energy to run than any other organ in the body, burning a whopping one fifth of the food that we consume. This makes the head hotter than the rest of the body, shown here by a heat-sensitive camera.
We invest so much in the brain because of its importance. It's what makes each one of us who we are. It's amazing to consider that I'm holding in my hands the place where someone once felt, thought and loved. From just looking at it, there's nothing to suggest very much ability at all. It appears rather gruesome - wrinkled like a walnut and with the consistency of mushroom.