- Collecting "imponderables" or interesting unanswered questions is one of my hobbies and I list a bunch of questions here. I decided to put them on this web site to encourage students to think creatively and identify deep questions. But anyone is welcome to enjoy them. I know the answer to some of them, but many are open questions to have fun with. Maybe some can never be answered. The questions are also here to encourage interdisciplinary thinking. The most exciting scientific problems in the century following 2001 will require a multidisciplinary approach. A challenge: If you email me a really elegant answer or discussion to any of these questions, I will display your contribution on this page.