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The two regional rivals have negotiated a deal, ending a seven-year lapse in diplomatic ties. Elsewhere, though, Iran remains aggressive. We ask what to make of its apparent inconsistency. Geothermal is a viable renewable source. What would it take for America to tap in? And, the multibillion-dollar Chinese industry being hit by a theory of covid-19’s originsFor full access to print, digital and audio editions of The Economist, try a free 30-day digital subscription by going to www.economist.com/intelligenceoffer