Every morning I put whole coffee beans in a small electric coffee mill, fit the cover into the mill and pulverize the beans. Then – no matter how carefully I try to avoid it – when I take the cover off and decant the ground-up coffee into the coffee pot, a thin layer of coffee grinds ALWAYS ends up on the countertop. Friends (who are not into physics) have reported the same experience – with different makes of grinders and coffeepots of glass and/or stainless steel – and have demanded to know why it happens. So far, all I've been able to surmise is that the little coffee bits are (somehow) each ending up with the same electrostatic charge and thus repel each other. But HOW does it happen?