President Donald Trump called the weekend strike on Sumy a “mistake”; other leaders called it a war crime. We examine the prospects for peace when Russia is brazenly hitting civilian targets. As scientists flee American institutions, Europe is trying to woo them (10:29). And Britain’s historical consumer-price index as a fascinating window into how shoppers’ tastes have shifted (17:24).Get a world of insights by subscribing to Economist Podcasts+. For more information about how to access Economist Podcasts+, please visit our FAQs page or watch our video explaining how to link your account.