The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Yawns are more contagious among people with closer relationships.
163
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
Enamel is hardest substance in the human body.
61
The human brain has the capacity to store everything that you experience.
4k
Chewing gum boosts your brain power.
285
The average sperm cell swims at 8 inches per hour.
76