Radioactivity may seem mysterious, but it has been part of our world at least since the Fall of Man.
When Marie Curie noted that uranium could make air conductive to electricity, she dubbed it "radioactive".
The more prosaic story that I was taught in grammar school was, a scientist found that uranium could make a radio click. Thus uranium made radio receivers active. Uranium is radio - active.
Many other naturally-occurring materials are radioactive as well.
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