New
#11
I prefer the version I heard at Uni while doing an engineering degree.
It starts with a mathematician and an engineer at a disco who spot a couple of girls the other side of the dance floor. It's the engineer who proposes a novel way of crossing to ask them to dance.... go half way, then half the remaining distance, repeat until we get over there. The mathematician says "but we'll never reach them" to which the engineer replies "well... close enough for all practical purposes."