You can't tickle yourself.
29
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
By weight, Bone is five times stronger than steel.
417
A human being loses an average of 40 to 100 strands of hair a day.
133
Pain occurs when sounds are above 130 db.
124
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
You forget 90% of your dreams.
256
The average person's skin weighs twice as much as their brain.
131