By age 18, the human brain stops growing. As a matter of fact, the human brain after age 18 begins to lose more than 1,000 brain cells each day. Do not fear: since the fully developed brain has over 100 billion cells, at the rate of losing 1,000 cells each day, it will take 300,000 years before your brain is out of cells.
An adult human’s brain weighs 3 pounds. The heaviest on record weighed 5 pounds.
Humans use about 100% of their brain. Modern MRI scans proved that people use just about their entire brain even when they are sleeping. It is a myth that humans use only 10% of their brains.
The human brain is capable of executing 10 quadrillion calculations per second--no computer today can match the human brain!If you think you're so smart, put your brain to the test with the BBC's Senses Challenge. It's annoyingly, frustratingly fun. Click here to take the test.