On the morning of March 10, I intend to take a shower, turn my face up to the spray and burble, “Thank God for the Guardian!” Not because I admire the left-wing politics of the British newspaper, where they seem to long for the days when the Brits’ income tax rate topped 90 percent and Nigel Farage hadn’t been born. No, March 10 will mark precisely one year since the Great Shower Debate ended. Or at least it ended for me when the Guardian published an article with the immortal headline “High shower pressure can help people save water, study...