Read this interesting post on the author’s“12 favorite problems,” which is a callback to something physicist Richard Feynman talked about. Most people look for solutions. But few seek out problems. There are exceptions. Physicist Richard Feynman, for example, liked to keep a list of his dozen favorite problems. These were big open-ended questions that could guide his life’s work. “Every time you hear a new trick or a new result, test it against each of your twelve problems to see wh...