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You can't live without being exposed to microbes.

Now if this article had included data showing that people with smart phones get sick more often and/or more severely than people who don't use smart phone.....or showing a correlation between the frequency of smart phone use and the frequency of colds etc.....I might decide to pay attention (though I have an ancient little cell phone that's anything but "smart").

And how about the Hygiene Hypothesis -- that we need exposure to microbes, especially when we're very young, to develop an effective and nonhyperreactive immune system. There's very compelling data linking the increasing lack of exposure/later and later exposures to the increasing incidence of asthma and allergies, etc.

I think we are germ-phobic, and that it's to our detriment. But then, my perspective would put the huge industry that caters to these fears out of business. In certain vulnerable settings, where patients have to be protected, it makes sense. But otherwise, I find it way overboard.

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