I just don't get it... I won't get it if I live another 100 years... why all the paranoia about dirt??? Hello- we live in a world made of DIRT... get over it!!! The more natural pathogens you remove, the weaker your immune system becomes. I live in a world made up of dust (which is 90% skin cells), dog hair, etc.. and I'm perfectly healthy (cough, cough). There's nothing wrong with all the stuff people are becoming so obsessive about removing... it's as natural as- well, DIRT!