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Fusion energy is perhaps the longest of long shots. To build a fusion reactor is essentially to create an artificial star. Scientists have been studying the physics of fusion for a century and working to harness the process for decades. Yet almost every time researchers make an advance, the goal posts seem to recede even farther in the distance.

In April 2018, in the famous Faraday Theatre at the Royal Institution in London, Carlo Rovelli gave an hour-long lecture on the nature of time. A red thread spanned the stage, a metaphor for the It…