The RiddlerThe most mind bending puzzles on the internet appear weekly in Oliver Roeder's "The Riddler" column. Presented by Nate Silver's FiveThirtyEight, this first ever collection features the column's most popular problems, along with six never before published puzzles, all exploring the math implicit in everyday occurences. The simplest require a mere flash of insight, while the toughest involve deep applications of analysis and probability theory. Designed