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The Wheel: From history we know that the first wheel was invented after humans used cylindrical tree trunks to move things that were heavy. The wheel first appears on clay tablets discovered in Mesopotamia. These tablets represent a cart on wheels and are more than 5,000 years old.
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SMARTPHONE: The first smartphone was designed by IBM in 1992 and was called Simon. It was shown as a concept product that year at the COMDEX expo.
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