David Darling and Agnijo Banerjee reveal the mathematics at the farthest reaches of our world - from its role in the plots of novels to how animals employ numerical skills to survive. Along the way they explore what makes a genius, why a seemingly simple problem can confound the best and brightest for decades, and what might be the great discovery of the twenty-first century. As Bertrand Russell once said, 'mathematics, rightly viewed, possesses not only truth, but supreme beauty'. Banerjee and Darling make sure we see it right again.