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Einstein's theory of general relativity 100 years on
Albert Einstein's theory of general relativity was 100 years old earlier this month.
He studied and later returned to work at ETH Zurich - the Swiss Federal Institute of Technology.
Einstein's further thinking gave birth to the idea of quantum physics and ÃÛÑ¿´«Ã½ Click's Spencer Kelly visited ETH Zurich to find out more.