A mechanic was removing a cylinder-head from the motor of a motorcycle when he spotted a well-known cardiologist in his shop. The cardiologist was there waiting for the service manager to come take a look at his bike. The mechanic shouted across the garage, "Hey Doc, want to take a look at this?"
The cardiologist, a bit surprised,
walked over to where the mechanic was working on the motorcycle. The
mechanic straightened up, wiped his hands on a rag and asked, "So Doc,
look at this engine. I open its heart, take the valves out, repair any
damage, and then put them back in, and when I finish, it works just like
new. So how come I make $30,000 a year and you make over half a million when you and I are doing basically the same work?"
The cardiologist paused, smiled and leaned over, then whispered to the mechanic,''Try doing it with the engine running."
Moral of the Story: Seemingly subtle variations make all the difference.