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  1. Paleontology

    Despite new clues, this ancient fish has stumped scientists for centuries

    The 50-million-year-old Pegasus volans isn't closely related to seamoths or oarfish, like some researchers have suggested. But what is it?

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  2. Artificial Intelligence

    A new book tackles AI hype – and how to spot it

    In AI Snake Oil, two computer scientists set us straight on the power and limits of AI and offer advice for moving forward.

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  3. Animals

    Scientists piece together clues in a shark ‘murder mystery’

    A missing porbeagle shark was likely killed by a great white. It’s the first known case of adult porbeagles being hunted by a predator, scientists say.