Albert Einstein wrote these words in a letter to his younger son, Eduard, in 1930. The letter came at a difficult time for the family, as Eduard was struggling with his health and his future, and Einstein chose to encourage him with an image that could hardly have been simpler. There were no references to physics, mathematics or the universe — only a bicycle. Nearly a century later, that single comparison has travelled much farther than the letter itself, becoming one of the most widely quoted observations ever associated with the scientist.
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