140 years ago today, Dmitri Mendeleev presented his new Periodic Table of the Elements to the Russian Chemical Society.
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140 years ago today, Dmitri Mendeleev presented his new Periodic Table of the Elements to the Russian Chemical Society. 98 years ago, the first Air Mail was delivered. 63 years ago today, the first general-purpose computer was unveiled. 8 years ago today, a little spacecraft showed that it could. 13 years ago today, the chess grandmaster Garry Kasparov met his match |
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