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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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31 jul 1906 año - Hans Geiger invented a device that could detect alpha particles.
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By
Saisriram Sanjai
15 may 2018
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313
fecha:
31 jul 1906 año
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~ 119 years ago
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