..........of the brain is water
- 40%
- 60%
- 80%
Only ........of the population are lefties.
- 8%
- 7%
- 9%
There are .........hairs in an average eyebrow.
- 450
- 350
- 250
Your thumb is the same length as your nose
- True
- False
The human brain stops growing at the ages of .....
- 14
- 16
- 18
The human tooth has about...... miles of canals in it.
- 25
- 55
- 65
Our ............ never stop growing
- nose and ears
- nose and knees
- eyes and ears
The storage capacity of the human brain exceeds 4 ......
- terabytes
- gigabytes
- megabytes
The acid in your stomach is strong enough to dissolve razorblades.
- True
- False
The brain operates on the same amount of power as .....-watt light bulb.
- 10
- 60
- 100