Sergiy Klymchuk is an Associate Professor of the School of Computing and Mathematical Sciences at Auckland University of Technology, New Zealand. He is a Fellow of the Institute of Mathematics and its Applications and a member of the Royal Society of New Zealand (RSNZ). He has more than 160 publications including three books on popular mathematics and science – Money Puzzles, Science Puzzles and Shape Puzzles, that have been, or are being, published in 11 countries. His book Counterexamples in Calculus received an Outstanding Academic Title award from Choice magazine of the American Library Association in 2010. Susan Staples is an Associate Professor of Mathematics at Texas Christian University. She served for ten years as graduate director of the TCU MAT program and continues to enjoy working with local teachers. She is the recipient of teaching awards from the University of Michigan, the University of Texas, and Texas Christian University. Her professional memberships include the MAA, AMS, AWM, NCTM and AAUW. Her graduate work was supported by an AAUW Fellowship. Currently she holds positions on two editorial boards for the MAA – The American Mathematical Monthly and the Classroom Resources Material book series.