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PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.

Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.

Members of the series are often called actinides, although actinium (at. 89) is not always considered a member of the series......

radiation sickness,harmful effect produced on body tissues by exposure to radioactive substances.

The biological action of radiation is not fully understood, but it is believed that a disturbance in cellular activity results from the chemical changes caused by ionization (see.....

Today, the city of San Francisco has set its sights on erecting a second downtown there.

But Treasure Island’s fate in the intervening decades—and a long-secret legacy of radioactive waste left behind—has complicated those plans.

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