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Five American states held primary elections yesterday. The most important were in Pennsylvania, where a Trump-backed candidate won the Republican gubernatorial primary. The Republican senate race remains too close to call. Wide-area motion imaging is a surveillance technique developed by the military in Iraq but now creeping into the civilian world. And why war in Ukraine is raising the price of berries in Britain. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer