This week’s five facts:
1. The brain uses over a quarter of the oxygen that is used by the human body.
2. Adult lungs have a surface area of about 70 metres squared.
3.Our tongue prints are completely unique.
4. Depending on how old you are, it's quite likely that you have eyelash mites. These creatures like to like live off old skin cells and sebum.
5. Every day the average person loses between 60 and 100 strands of hair.