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Henri Becquerel discovers radioactive decay.
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Henri Becquerel
French nuclear physicist (1852–1908)
Antoine Henri Becquerel was a French nuclear physicist who shared the 1903 Nobel Prize in Physics with Marie and Pierre Curie for his discovery of radioactivity.Source: Wikipedia (CC BY-SA)
Radioactive decay
Emissions from unstable atomic nuclei
Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay. The weak force is the mechanism that is…Source: Wikipedia (CC BY-SA)