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This year's economic summit, arranged for next week, is unlikely to break with the bland self-reassurance that has become its tradition. But the seven governments need more imagination than usual.
Attempts continue to account for the occurrence of quasicrystals with fivefold symmetry, and are to be applauded. The case for believing them important is less sure.
Decisions made about the world's economy have consequences for Earth's climate. At their forthcoming meeting in Toronto, the leaders of the West must take that into account.
