Groucho Marx never discussed on-screen, but in a famous scene in "Duck Soup," where both Chicolini (Chico) and Pinky (Harpo) disguise themselves as Groucho, they are briefly seen applying the greasepaint, implicitly answering any question a viewer might have had about where he got his mustache and eyebrows. Marx was asked to apply the greasepaint mustache once more for "You Bet Your Life" when it came to television, but he refused, opting instead to grow a real one, which he wore for the rest of his life. By this time, his eyesight had weakened enough for him actually to need corrective lenses;
Influences on Karl Marx "when Darwin drew the conclusions from his research work and brought them to the knowledge of the public, we spoke of nothing else for months but Darwin and the enormous significance of his scientific discoveries". Historian Richard Weikart points out that Marx had started to attend "a series of lectures by Thomas Henry Huxley on evolution". In August 1866, Marx referred to Pierre Trémaux's "Origine et transformations de l'homme et des autres êtres" (1865) in another letter to Engels as "a very important advance over Darwin". He went further to claim that "in its historical and political application" the book