Radium
Radium is a naturally occurring radioactive metal. When exposed to it, the element causes lymphoma, bone cancer, leukemia, and aplastic anemia. Its extremely high levels of radioactivity make it a dangerous health concern. The maximum amount of radium the body can take is 0.1 micrograms. It is so dangerous that Marie Curie's notes on her discovery of radium are still so radioactive that they cannot be touched to this day.
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