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In this book, Leopold says that in the future people will say about him, “that guy who collaborated with Einstein, and they wrote a book together, but I don’t remember his name.” Here is a description of not only that collaboration, but of his journey from the ghetto in Cracow, Poland, to the universities in Lwow, Cambridge, Princeton and Toronto. Leopold Infeld was not only a scientist, but a fighter for world peace who was against his will forced to join the Austro-Hungarian army during the First World War. He was also a loving husband and father, and a tireless promoter of young physicists starting up on their own scientific quests in post-war Poland.