Human teeth are almost as hard as rocks!
47
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
Tap water in Canada is held to a higher health standard than bottled water.
19
A person can live without food for about a month, but only about a week without water.
156
The pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
130
Banging your head against a wall uses 150 calories an hour.
57
By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
9
Redheads require up to 20% more anesthesia to be knocked out.
112