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The tepid debut of Britain\\u2019s dominant food-delivery app signals doubts not only about the gig economy but also about London\\u2019s ability to lure tech-firm listings. Chinese officials love to deploy \\u201ccloud seeding\\u201d to water the country\\u2019s parched lands, but even if it works, it distracts from better water-management policies. And why tweets so often come back to haunt their authors.

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