Don't tell them: show them. I've found they get quite a reaction to the mess underneath illustrated by the PHK article below. https://queue.acm.org/detail.cfm?

Don't tell them: show them. I've found they get quite a reaction to the mess underneath illustrated by the PHK article below. https://queue.acm.org/detail.cfm?id=2349257 https://queue.acm.org/detail.cfm?id=2349257