Good for him for acknowledging his mistake. He seems to have moved fairly quickly from his original flawed advice to an unsatisfying "[I] was inarticulate" and

Good for him for acknowledging his mistake. He seems to have moved fairly quickly from his original flawed advice to an unsatisfying "[I] was inarticulate" and on to a solid "I answered that question completely wrong". Getting all the way there by the end of the day is admirable, and the lesson of that goes a long way toward making up for the original mistake. And while I'm handing out praise, good for President Klawe for calling out Nadella on his answer and providing a better one. (She's been leading some great changes at my alma mater, and this sort of thing has a lot to do with why.)