Lesson #550
Hunt in Australian Outback for a tiny, radioactive capsule
A radioactive capsule the size of a pencil eraser fell of a truck in Western Australia. The capsule was part of a machine used in mining for iron ore. That led mining giant Rio Tinto and the Australian government to search a 1,400-kilometer stretch of desolate highway, searching for something the size of a pea. Plus, learn the phrasal verb "set off."