This article summarizes several surprising facts about the brain. The brain is a very complex and powerful human organ. It takes up to 20% of our caloric intake alone, and deep thoughts can actually be fatiguing. The article claims the brain is 75% water, and also claims the brain is 60% fat, two facts that seem contradictory. Our intelligence may be declining, as a species. Alcohol can suspend the formation of memories, which is what causes “blackouts.” And finally, neurochemicals are often produced not just in our brains, but in our intestines.