Where do they come up with the brain is 60% fat? Your brain has been called the most complex object in the universe – countless experiments have yet to uncover how and why it functions. Some random Facts about the brain: The weight of your brain is about 3 pounds. Your brain is made up of about 75 percent water and feels like Jello to the touch! Your brain consists of about 100 billion neurons. The brain has the most mitochondria of any organ ( esp. the frontal cortex). Pain receptors are absent in your brain, so your brain can...