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Our Most-Read Stories of 2017

More than one hundred years later, Becquerel's accidental discovery of spontaneous radioactivity still intrigued our readers; it was our most-viewed story of this year. In...

The Discovery of Radioactivity – That Time the Sun Didn’t Shine In Paris

On this day, 121 years ago, Henri Becquerel opened the drawer where he kept his photographic plates and realized his experiments took an unexpected turn.