Interesting article. On a somewhat related note, a few years back my GP advised me to eat the odd piece of food that had been dropped on the floor, and to stop

Interesting article. On a somewhat related note, a few years back my GP advised me to eat the odd piece of food that had been dropped on the floor, and to stop cleaning as much; the reason being that a blood test had revealed I was low in zinc. His reasoning was that since dust has reasonable quantities of zinc, I should be able to be adequately provided with it via my environment. Apparently his idea worked, because in the next test my zinc was over the ideal (This could be a fluke, of course).