Louis Bolk
Lodewijk 'Louis' Bolk was a Dutch anatomist who created the fetalization theory about the human body. It states that when a human being is born, it is still a fetus, as can be seen by its (proportionally) big head, lack of coordination, and helplessness. Furthermore, this "prematuration" is specifically human.
10 December 1866
Born on the same birth day (10 December): Ada Lovelace • Ambrosio Padilla • Barbara Nichols • Carlos Rodón • Fionnula Flanagan • Harold Gould • Iain Brunnschweiler • John de Wolf • Mako (actor) • Michael Clarke Duncan • Richard Kennar
Born in the same month (December 1866): Alfred Werner • Harry Burleigh • John Beresford, 5th Baron Decies • Kazys Grinius • Maud Gonne • Roger Fry • Traian Demetrescu • Wassily Kandinsky