In 1995, he and Thomas Bopp spotted, from different states, the same mysterious object in the sky. What turned out to be a comet was named after them: Hale-Bopp.
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NPR's Short Wave team talks about how air pollution affects the brain, what ancient squirrel poop reveals about prehistoric fauna, and a whale graveyard on the ocean floor.
The public sale is also expected to make Elon Musk the world's first trillionaire.