Parsons profiles marine biologist Jeanne Villepreux-Power, who solved a 2000-year-old mystery about an octopus with a shell. Villepreux-Power collected argonaut eggs and watched through a microscope as they grew, preserving each stage in her embalming fluid. She saw that the argonaut could patch its shell by secreting a liquid from the arm membranes, and realised that these membranes were how it made its shell in the first place. She became the first female member of the Gioenia Academy, and had a deep-water fish named after her: Viriciguerria poweriae.
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