Fritz Haber may be the ultimate human paradox. The German chemist who learned to pull nitrogen from the air and turn it into fertilizer helped make it possible for the planet to feed nearly eight billion people, yet the same mind is remembered as the father of chemical warfare. This deep dive traces his life from a lonely childhood in Breslau to a lonely death in exile.

We explore how a desperate need to be accepted as a German patriot drove his conversion from Judaism to Lutheranism, his Nobel Prize-winning ammonia breakthrough with Carl Bosch, and his personal oversight of the chlorine gas attack at Ypres in 1915. We also confront the tragedy of his wife Clara Immerwahr, his failed scheme to mine gold from seawater, and the bitter irony of a nation that cast him out in 1933.

• How the Haber-Bosch process broke nitrogen’s triple bond using extreme heat, pressure, and a metal catalyst
• Why roughly half the nitrogen in your body traces back to synthetic fertilizer, and the environmental cost of runoff and dead zones
• Haber’s loophole around the Hague Conventions and the cold calculations behind Haber’s Rule
• The suicide of Clara Immerwahr, the first woman to earn a chemistry PhD at the University of Breslau
• How Zyklon A research at his institute was later altered by the Nazis into Zyklon B, and why Einstein called his life a tragedy of unrequited love