#OnThisDay, 20 Apr 1902, Maria Skłodowska-Curie and Pierre Curie refine radium chlorine. The discovery leads to Marie being the first woman to win the Nobel Prize for Physics in 1903. The committee had planned to only award the Nobel to Pierre and Henri. Committee member and Swedish mathematician Magnus Gösta Mittag-Leffler alerted Pierre Curie to the plan. Pierre insisted Marie also receive the prize. #WomenInHistory #OTD #History #WomenInSTEM #NobelWomen #Histodons