I'l explain this way:
There was a sales person and an engineer
competing for a job. They were each posed the same problem -
You are at a dance and the boys are on one side of the room and the girls are on the other. You are lined up with an amazingly beautiful girl and when you touch you can have her.
Each time the song stops you can move 1/2 the distance to the girl.
How long until you can have her?
being brilliant and always requiring himself to have the precise correct answer said, "It's impossible. I will never have the girl."
The sales guy said, "When I get within 6 inches I'm close enough."