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‘Why are there beings at all instead of nothing? That is the question,’ said philosopher Martin Heidegger.

In 1929, German philosopher Martin Heidegger gave a lecture at the University of Freiburg. He spoke at length — poetically and densely — about nothing. Many were enthralled by his talk, but scientist-philosopher Rudolf Carnap thought his talk of nothing, added up to… nothing. (Shutterstock / Jared Romanowicz)