The oldest wheel known is from Mesopotamia, around 3500 B.C.
The wheel serves a vital purpose in our lives, and we couldn't imagine the world without them
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THE STEAM ENGINE
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One of the key ingredients of concrete is cement.
Around 3400 B.C. bronze nails were found in Egypt. According to the University of Vermont, the hand - wrought nails were a norm until the 1790s and early 1800s.
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