SO TELL me Mr Einstein, why does E equal mc squared? You can now hear the answer from the man himself, in a short recording made for a film in 1947. You can also hear Einstein speaking for the Refugee Assistance Fund at London’s Royal Albert Hall in 1933; on radio discussing the “common language of science”; and with George Bernard Shaw at the Savoy Hotel in 1930.
Albert Einstein: Historic recordings Audio CD
British Library Publishing


