A ship engine failed, no one could fix it. Then they brought in a man with 40 years on the job experience. He inspected the engine carefully, top to bottom. After looking things over, the guy reached into his bag and pulled out a small hammer. He gently tapped something. Instantly, the engine lurched into life. The engine was fixed! 7 Days later the owners got his bill for $10,000. “What?!” the owners said, “You hardly did anything. Send us an itemized bill.” The reply simply said Tapping with a hammer: $2, Knowing where to tap: $9,998.
Don’t ever underestimate experience.