While mathematicians are undoubtedly brilliant, there are still questions they can't answer. Every mathematical question is a puzzle and there'll be plenty of puzzles for you to chew on while mathematician Katie Steckles introduces questions that still leave mathematicians stumped, from simple-sounding number and shape problems to mind-bending fundamental questions. - See more at: http://www.sciencefestival.cam.ac.uk/events/maths-greatest-unsolved-puzzles-limited-returns-available-door#sthash.0IclHIqX.dpuf