JM By missnicholls2016 177 Joseph Priestley invented soda water. Jan 1, 1800 Coenraad Johannes van Houten discovered cocoa powder. Jan 1, 1821 Pierre Jean Robiquet discovered caffeine. Jan 1, 1878 Ira Remsen developed the first artificial sweetener. Jan 1, 1885 Louis Pasteur created the first vaccine.