"Germany had been united in empire for only eight years when Einstein was born in Ulm on March 14, 1879. He grew up in Munich. He was slow to speak, but he was not, as legend has it, slow in his studies; he consistently earned the highest or next-highest marks in mathematics and Latin in school and Gymnasium. At four or five the "miracle" of a compass his father showed him excited him so much, he remembered, that he "trembled and grew cold." It seemed to him then that "there had to be something behind objects that lay deeply hidden."624 He would look for the something which objects hid, though his particular genius was to discover that there was nothing behind them to hide; that objects, as matter and as energy, were all; that even space and time were not the invisible matrices of the material world but its attributes. "If you will not take the answer too seriously," he told a clamorous crowd of reporters in New York in 1921 who asked him for a short explanation of relativity, "and consider it only as a kind of joke, then I can explain it as follows. It was formerly believed that if all material things disappeared out of the universe, time and space would be left. According to the relativity theory, however, time and space disappear together with the things."