More people have a phobia of frogs than rats.
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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.
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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