The human brain is more complex than any other known structure in the universe. Weighing in at three pounds, on average, this spongy mass of fat and protein is made up of two overarching types of cells — called glia and neurons — and it contains many billions of each.
- About 75 percent of the brain is made up of water. This means that dehydration, even in small amounts, can have a negative effect on the brain functions.
- Your brain generates about 12–25 watts of electricity. This is enough to power a low wattage LED light bulb.
- When you find yourself sleeping in a new environment for the first time, the brain processes danger and remains half-awake in order to be more aware.