In my 20s, I cohabited with a man who thought you didn’t need to wash towels because you used them when you were clean. This was someone, I should add, who graduated from both Oxford and Cambridge and now has a very high-powered job. (Not that any of that means you have an ounce of common sense, of course.) Anyway, I obviously teased him mercilessly about this. What a nitwit, I thought.

But now I have a terrible confession to make. I too am a nitwit. You see, about a year ago, I replaced my trusty clear plastic water bottle, which was super easy to clean, with one of the trendy brands made of stainless steel........

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