More perplexing is the refusal of both Mr Obama and Mr Ryan to put forward a plan on Social Security, whose problems are more manageable and for which Simpson-Bowles advanced a balanced solution.
The problems it created were very perplexing.
The Atiyah video had turned the obscure pediatrician into the most sought-after informant in either intelligence service, yet much about the case was perplexing.
As an added bonus, an "x" particle could solve another perplexing cosmological mystery: why is there more matter than antimatter in the universe?