After age 30

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After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year

Hey! Did you know that...

The time until unconsciousness after loss of blood supply to the brain is about eight to 10 seconds. (So don’t let anybody squeeze your neck.)

The human brain cell can hold five times as much information as the Encyclopedia Britannica.  

The brain is soft and gelatinous - its consistency is something between jelly and cooked pasta.

The human brain is about 85% water

The average number of nerve cells (neurons) in the brain is 100 billion.


 Nerve impulses to and from the brain travel as fast as 170 miles per hour.