" His son Peter Bucky happily spent time driving Einstein around, and he later wrote down some of his recollections in extensive notebooks. They provide a delightful picture of the mildly eccentric but deeply un-affected Einstein in his later years. Peter tells, for example, of driving in his convertible with Einstein when it suddenly started to rain. Einstein pulled off his hat and put it under his coat. When Peter looked quizzical, Einstein explained: “You see, my hair has withstood water many times before, but I don’t know how many times my hat can. "

― Walter Isaacson , Einstein: His Life and Universe