In the early 20th century German geophysicist and meteorologist Alfred Wegener proposed the theory of continental drift, suggesting that continents were not fixed on Earth’s surface but had mi­­grated widely during the planet’s history. Wegener was not a crank: he was a prominent scientist who had made important contributions to meteorology and polar re­­search. The idea that the now separate continents had once been somehow connected was supported by extensive evidence from stratigraphy and paleontology—evidence that had already inspired other theories of continental mobility. His proposal did not get ignored: it was discussed throughout Eur­ope, North America, South Africa and Australia in the 1920s and early 1930s. But a majority of scientists rejected it, particularly in the U.S., where geologists objected to the form of the theory and geophysicists clung to a model of Earth that seemed to be incompatible with moving continents.