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AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
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20 Feb 1896 Jahr - Henri Becquerel: While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.

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Datum:

20 Feb 1896 Jahr
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~ 128 years ago