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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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20 agos 1895 anni - Lord Rayleigh reported the discovery of a new gaseous element named argon which proved to be chemically inert.

Aggiunto al nastro di tempo:

Data:

20 agos 1895 anni
Adesso
~ 130 years ago