In a high school gym class, all the girls are lined up against one wall,

and all the boys against the opposite wall. Every ten seconds, they walk

toward each other exactly half the remaining distance between them.

A mathematician, a physicist, and an engineer are asked, “When will the

girls and boys meet?” Mathematician: “Never.” Physicist: “In an infinite

amount of time.” Engineer: “Well… in about two minutes, they’ll be close

enough for all practical purposes.”