140 years ago today, Dmitri Mendeleev presented his new Periodic Table of the Elements to the Russian Chemical Society.

 

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98 years ago, the first Air Mail was delivered.

 

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63 years ago today, the first general-purpose computer was unveiled.

 

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8 years ago today, a little spacecraft showed that it could.

 

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13 years ago today, the chess grandmaster Garry Kasparov met his match

 

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