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Astronauts to conduct McAuliffe's lessons in space

Two teachers-turned-astronauts plan to carry out four lessons that teacher Christa McAuliffe planned to lead in space before she was killed in the 1986 explosion of the Space Shuttle Challenger. The lessons will be conducted by Joe Acaba and Ricky Arnold, filmed and posted online by the Challenger Center, which supports science, technology, engineering and math education.

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