Pi Day savings (32%) from the National Academies Press

In case you haven’t already guessed, today we’re celebrating Pi Day! Our love for this irrational holiday is constant, so today only we’re offering 31.415 (32%) off our math titles and merchandise. Unlike Pi, this sale won’t last infinitely so make your purchase by March 21. Enter code PIDAY at checkout to receive this discount. Struck by Lightning: The Curious World of Probabilities $24.95 $16.97 Unknown Quantity: A Real and Imaginary History of Algebra  $27.95 $19.01 Einstein Defiant: Genius Versus Genius in the Quantum Revolution  $15.95$10.85 Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics (PDF)  $21.50$14.62 A Beautiful Math: John Nash, Game Theory, and the Modern Quest for a Code of Nature (PDF)  $21.50 $14.62 The Secret Life of Numbers: 50 Easy Pieces on How Mathematicians Work and Think (PDF)  $19.50 $13.26 Fueling Innovation and Discovery: The Mathematical Sciences in the 21st Century $19.95 $13.57 Frontiers in Massive Data Analysis  $46.00 $31.28 The Mathematical Sciences in 2025  $48.00 $32.64 Euclid Mug  $13.50 $9.18 Math Mug  $13.50 $9.18 Einstein Finger Puppet  $7.00$4.76