More people have a phobia of frogs than rats.
41
On average, there's 100 billion neurons in the human brain.
83
Every hour one billion cells in the body must be replaced.
17
Chewing gum boosts your brain power.
285
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
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
The heart pumps about 1 million barrels of blood during an average lifetime!
30

