Stop painting cells and use conditional formatting to build accessible, formula-ready, and automated Excel spreadsheets.

It’s part of the scenario in “The Day After Tomorrow,” but scientists differ over whether or how fast it may occur. A team studying the current toils to bring clarity.

But scientists say a warming world is throwing off this balance. As Arctic ice melts, freshwater enters the North Atlantic — making the ocean water less dense, so it is less likely to sink. As a ...