#OTD Today is the birthday of french botanist Lucien Plantefol (April 24, 1891-1983).
He developed his own theory to explain how leaves are arranged on the stems of plants. He served in the First World War. Modern chemical warfare began in his home country, France, on April 22, 1915, when German soldiers attacked the French by using chlorine gas. Plantefol was wounded during the war, but he went on to serve his country by working on a team at a national defense laboratory that developed the gas mask.