The World of Facts

In 1972, Apollo 17 astronaut Captain Eugene Cernan became the last man on the moon. Cernan, a US navy fighter pilot handpicked by NASA in 1966 despite not applying for space programme, nor having gone to test pilot school, went on to fly three space missions. 

The mean volume of a mammal cell is estimated to be 4 billionths of a cubic centimeter. Based on an adult man's typical volume, you might conclude that the human body contains 15 trillion cells.

There are no pain receptors in the brain itself. But the meninges (coverings on the bones), periosteum (coverings on the bones), and the scalp all have pain receptors. Surgery can be done on the brain and technically the brain does not feel that pain. With that said, the brain is the tool we use to detect pain.

A solar year is the time it takes the Earth to complete its orbit around the Sun- about one year. but the actual time it takes for the Earth to travel around the Sun is in fact a little longer than that- about 365 days,5 hours, 48 minutes and 48 seconds, to be precise.