Once upon a time, no one tested metal products to see if they would hold up. In fact, that is how many swords and daggers ended up broken in battle. Eventually, blacksmiths figured out how to make stronger metal, steel, and how to test it for strength. That testing involved repeatedly striking metal products with objects to see if the metal products would hold up. Fast forward and you'll see that machines were developed to twist, hammer, drop, strike and attempt to bend metal products.
31 December 2017