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Which of these was first discovered? 7000 BC
And next? 2000 BC
And next? 1628
And next? 1687
And next? 1766
And next? 1781
And next? 1866
And next? 1897
And next? 1912
And next? 1930
And next? 1953
The last one, and you're done! 1992
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Elements refer to the date they were first used, not classified as such.
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Last Updated: Sep 19, 2017
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