5.5K views · 61 reactions | OPERANT CONDITIONING~part 12 of 15~~find out more about the operant condition program at Big Cat Rescue, the purpose, importance, how it is carried out for the cats at different levels and training involved for the keepers. #BigCatRescue #BigCats #Rescue #Conservation #Wildlife #Sanctuary #Florida #OperantConditioning #Training #NeedToKnow #Interesting #Information #CaroleBaskin | Big Cat Rescue | Facebook

Born a Slave, Invented the Modern Mixer in 1884 The incredible true story of Willis Johnson (1857-1923), an African-American man born into slavery who invented the rotary egg beater that revolutionized cooking. On February 5, 1884, Johnson from Cincinnati, Ohio patented a dual-chamber hand-cranked mixer that could beat eggs in one side while mixing batter in the other. Before his invention, all cooking ingredients had to be mixed painfully by hand. Historians believe Johnson was illiterate, yet