3 ms·Has our war on microbes left our immune systems prone to dysfunction?11 points by SeanDav 14y agolazydon 14y agoThis is every parent’s dilemma http://en.wikipedia.org/wiki/Hygiene_hypothesis http://en.wikipedia.org/wiki/Hygiene_hypothesiszmonkeyz 14y agoSometimes I wonder if biting my fingernails has helped my immune system.