“The Modern World began on 29 May 1919 when photographs of a solar eclipse, taken on the island of Principe off West Africa and at Sobral in Brazil, confirmed the truth of a new theory of the universe.”1 The new theory of the universe was Einstein’s General Relativity, a radical, mysterious, new explanation of gravity, destined to replace the more intuitive and accessible theory of Isaac Newton that had inspired and sustained the Enlightenment.”

Paul Johnson Modern Times: The World from the Twenties to the Nineties