Matt Parker (Foreword By) Originally a maths teacher from Australia, Matt Parker is now a stand-up comedian and a YouTuber with over one hundred million views. He is the author of the #1 bestseller Humble Pi and Things to Make and Do in the Fourth Dimension. Matt is also frequently seen, heard, and read on the Discovery Channel, on BBC radio, and in The Guardian, in that order. He has previously held world records for both the Rubik's Cube and Space Invaders. In the pursuit of maths, Matt has: flipped a coin 10,000 times, travelled to Antarctica, memorized pi to hundreds of digits, and been bitten by a bullet ant in the Amazon rainforest. Matt has given maths lectures at Cambridge University, Oxford University, Harvard University and Lake Monger Primary School.