In 2018, Russian paleontologists discovered in Siberia the almost perfectly preserved frozen body of a cave lion cub. They named her Sparta. She was 32,000 years old, with blond fur, perfectly intact claws, and she looked as if she were asleep. What no one knew at the time was that Sparta carried a secret in her cells that would take years to decode: she and her kind were not, as previously thought, simply a larger, furrier version of the African lion, but something far more extraordinary.

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