On average, someone in the US suffers a stroke every 40 seconds; someone dies every 3 minutes from stroke.
57
Every hour one billion cells in the body must be replaced.
17
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
If your stomach didn't produce a new layer of mucous every two weeks, it would digest itself.
33
A human being loses an average of 40 to 100 strands of hair a day.
133
In older people, memory is best early in the morning and then declines during the late afternoon.
33
When you look up at the blue sky and see white dots flying around, you’re actually seeing your own white blood cells.
30
Dating back to the 1600's, thermometers were filled with Brandy instead of mercury.
16