The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The average sperm cell swims at 8 inches per hour.
76
The average person's skin weighs twice as much as their brain.
131
The idea of left brain (logical) and right brain (creative) has no basis in neuroscience and is in fact a myth.
16
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266