Astronaut Richard “Ricky” Arnold floated aboard the International Space Station in 2019, steadying floating orbs of water with his fingertips as he looked straight into the camera — speaking not to scientists or engineers, but to classrooms full of children.
Three decades earlier, Christa McAuliffe had intended to do the same. As national mourning continued over the loss of the Challenger crew, her lessons faded into the periphery.
Arnold and fellow astronaut …
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