About this guide
Uranium was discovered in 1896. Scientst have investigated its properties ever since.
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Everyday products that contain radioactive elements such as radium may also be radioactive. Elements like uranium and radium become radioactive when the nucleus of the atoms undergoes radioactive decay. In this clip, a scientist challenges people to identify which products, such as brazil nuts and a smoke alarm, are radioactive. Do you think the scientist provided sufficient evidence for his explanation?