Camouflaged personnel with no insignia, protesters bundled into unmarked vans: the
President Donald Trump's plan to put federal officers into American cities is a worrying political ploy. Our annual
Big Mac index examines which currencies are over- and undervalued; we take a meaty look at what burgernomics reveals. And Indian scientists
simultaneously solve a water problem while taming a fire problem. For full access to print, digital and audio editions of
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