Here are some fun facts about one's brain. Enjoy!
The adult human brain weighs about 3 pounds.
The adult human brain is about 2% of the total body weight.
The elephant brain weighs about 6,000 g.
The human brain has about 100,000,000,000 (100 billion) neurons.
The octopus brain has about 300 million neurons.
The total surface area of the cerebral cortex is about 2500 sq. cm (~2.5 ft2)
The world record for time without sleep is 264 hours (11 days) by Randy Gardner in 1965.