As one listener points out, we might not have carrot cake today if Germans weren't forced to bake with ersatz materials during World War I. This little girl might have had to settle for chocolate instead. Fox Photos/Getty Images hide caption

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Vladimir Lenin in 1900. In our counterfactual history, his career as the producer of the musical Pins and Needles is only a few years away. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images

This illustration from an Italian newspaper depicts Gavrilo Princip killing Archduke Francis Ferdinand on June 28, 1914. Achille Beltrame/Wikimedia Commons hide caption

itoggle caption Achille Beltrame/Wikimedia Commons