How much does a nail cost? Maybe around 10 rupees. But when it’s used in a watch, it’s value goes upto 1000 rupees.If it’s used in an aircraft or in a rocket, it may cost 100,000 rupees.The same metal piece has been used in all three scenarios. But the value of it has increases rapidly with each usage.However, it has to go through several process like hardening, smoothening, sharpening, softening, sharpening and so on for

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