British and European regulators have addressed a possible link with blood clots. Expect more rare side-effects to emerge; what seems clear for now is that the vaccine’s benefits outweigh any risks. A new analysis shows that a racist American film from 1915 left a long legacy of racial violence. And a shady history of the function and fashion of sunglasses.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
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