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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." -- At Plain English, we make English lessons for the modern world. -- Today’s full English lesson, including a free transcript, can be found at: https://plainenglish.com/550 -- Learning English should be fun! That’s why our lessons are about current events and trending topics you care about: business, travel, technology, health, science, politics, the environment, and so much more. Our free English lessons always include English expressions and phrasal verbs, too. -- Learn even more English at PlainEnglish.com, where we have fast and slow audio, translations, videos, online English courses, and a supportive community of English learners like you. Sign up free at