Title: The Book of Perfectly Perilous Math: 24 Death-Defying Challenges for Young Mathematicians, Author: Sean Connolly
Title: Professor Stewart's Hoard of Mathematical Treasures, Author: Ian Stewart
Title: Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin, Author: Lawrence Weinstein
Title: Riddles in Mathematics: A Book of Paradoxes, Author: Eugene P Northrop