A Neat Detergent Trick

Some time ago I described the nature of detergents, with particular emphasis on a neat demonstration you can do.

Well, someone has come up with an even better one.

To reiterate what I said before, detergents are surfactants, which is an abbreviation of surface active agent – so any detergent loves surfaces, and this is why they clean dishes – they go looking for any interface they can find – liquid/solid or liquid/air. So when the tiny drop of detergent touches the surface it spreads out along the surface, pushing the pepper out of the way.