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
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Your thumb is about the same size as your nose.
124