This week, a group of about 100 physicists and philosophers have gathered in Munich to reassess a question at the heart of science: “Why trust a theory?” In an opinion piece by George Ellis and Joe Silk, published in Nature earlier this year, the two physicists expressed worry about current developments in some areas of theoretical physics. In particular, they were concerned with untestable attempts to address the fundamental questions concerning space, time and matter. Their article gave rise to the idea of the current meeting.

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