In physics and other fields, a thought experiment (from the GermanGedankenexperiment) is an experiment that is not intended to be performed. These experiments are used to attempt to understand something about the universe.
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Leif Ericsson, (born 970), attempted to colonize Vinland
George Everest, (1790-1866)
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Matthew Flinders, (1774-1814), first to circumnavigate Australia and ...