In this fascinating video by Michael (I don’t know his last name) at Vsauce channel on YOUTUBE
http://www.youtube.com/user/Vsauce
…gives a brilliant explanation about fingerprints and in so doing, a nice and quick explanation about the largest organ in our body….our skin.
Take a look…this is an enjoyable six minutes:
http://devour.com/video/how-many-calories-are-on-a-smudgy-screen/