After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
You inhale about 700,000 of your own skin flakes each day.
29
The average sperm cell swims at 8 inches per hour.
76
The average human body contains enough iron to make a small nail.
50
The average person who stops smoking requires one hour less sleep a night.
79
Redheads require up to 20% more anesthesia to be knocked out.
112
It takes 17 muscles to smile, 43 to frown.
65