It takes 17 muscles to smile, 43 to frown.
65
The average person's skin weighs twice as much as their brain.
131
Most dreams last only 5 to 20 minutes.
79
Your skeleton keeps growing until you are about 35, then you start to shrink.
74
In the average lifetime a person will breath in about 44 pounds of dust.
21
By weight, Bone is five times stronger than steel.
417
In one day, adult lungs move about 10,000 litres of air.
11
If you are cold you are more likely to be hungry because you use energy to keep warm.
144