A byproduct of aging nuclear weapons stockpiles could help power spacecraft on missions lasting decades. Americium-241, an ...

A rhino named Beckham after the former England footballer is one of the animals who have had the pellets injected into their horns - Cebisile Mbonani/Bloomberg ...

Lasers, heat and a notoriously tricky element are at the center of a quiet revolution in how the United States plans to power ...

NEW YORK — South African scientists on Tuesday injected radioactive material into live rhino horns to make them easier to detect at border posts in a pioneering project aimed at curbing poaching. The ...

Beckham, a 1.7 ton rhino named after the English footballer, on Tuesday had a radioactive pellet drilled into his horn as a program to discourage poaching of the endangered animals in South Africa ...

Plutonium is not a fun word to speak, hear, or write. Used to depict an actinide metal we've known about for some time, it has become synonymous with human-caused destruction on a hard-to-comprehend ...