โ€œI do not want to live without my cheese slicer.โ€ โ€œThe cats are wearing shoes.โ€ โ€œThe vegetables do not like vegetarians.โ€ Sometimes, Duolingo, my smartphone language app, comes up with strange sentences. It always made me laugh. But, lately, thereโ€™s been a weird glitch with the app. Iโ€™ve been...