Look at this formula: n^2 + 9 + 9. It's called McDonald's Theorem. If we plot its graph, we arrive at this unusual shape, a uniformly curved line which somehow joins up with itself that science has yet to find a name for. Can you think of a name for it? If you can, the Royal Mathematics Society would like to hear from you. Because they hold a competition each year to find a name for this figure. The final takes place in Nottingham on April the 4th of September. And you could win your school this computerized toast system. So, good luck!