Aquatic Scholar Eugenie Clark Forever First Class Postage Stamps

Eugenie Clark, 1922 to 2015, was a marine biologist who spent a career arguing that sharks were not what people thought they were. She ran more than 200 expeditions, showed that lemon sharks could be trained to complete complex tasks, disproved the idea that every shark must keep swimming to stay alive, described several new fish species, and found one that naturally repels sharks. She was still diving in her nineties. The press called her the Shark Lady and she used the name rather than fighting it.

The stamp gets bought by the constituency you would expect - aquariums, dive operators, marine science departments, conservation groups - and by people who want a woman scientist on their mail rather than a flower. It works for fundraising letters, membership renewals and school correspondence, and it pairs naturally with the Sharks issue if you want the animal and the person on the same envelope. Sheets of 20, and the portrait is legible enough at stamp size that people ask about it, which is more than most commemoratives manage.