- Nobody knows why the dollar sign takes the shape it does.
- Nobody knows where the name "Des Moines" comes from. It may come from a corruption of the French "the monks", but that has never been firmly concluded.
- Nobody knows why the name "America" was applied to the continents of the Western Hemisphere. We think it comes from the name Amerigo Vespucci, but that has been contested from many angles.
- Nobody knows why reporters used to conclude their stories with the symbol "-30-".