someone who travels into little known regions (especially for some scientific purpose) | United States astronomer who discovered Phobos and Deimos (the two satellites of Mars) (1829-1907) |
| United States explorer who led three expeditions to the Arctic (1821-1871) |
| United States chemist who developed an economical method of producing aluminum from bauxite (1863-1914) |
| United States child psychologist whose theories of child psychology strongly influenced educational psychology (1844-1924) |
| English writer whose novel about a lesbian relationship was banned in Britain for many years (1883-1943) |