Starting with hands, abacus and slide rule, humans have always reached for tools to simplify math. Pocket-sized calculators ushered in modern mathematics, helped build the atomic bomb, took us to the bottom of the ocean and accompanied us to the moon. The pocket calculator changed our world, until it was supplanted by more modern devices that, in a cruel twist of irony, it helped to create. The calculator is dead; long live the calculator. In this witty mathematic and social history, Keith Houston transports readers from the nascent economies of the ancient world to the First World War, where a Jewish engineer calculated for his life at Buchenwald, and into the technological arms race that led to the first affordable electronic pocket calculators. At every turn, Houston is a scholarly, affable guide to this global history of invention. Empire of the Sum will appeal to maths lovers, history buffs and anyone seeking to understand our trajectory to the computer age.

A charming and indispensable tour of two thousand years of the written word, Shady Characters weaves a fascinating trail across the parallel histories of language and typography.

Whether investigating the asterisk (*) and dagger ( ) which alternately illuminated and skewered heretical verses of the early Bible or the at sign (@), which languished in obscurity for centuries until rescued by the Internet, Keith Houston draws on myriad sources to chart the life and times of these enigmatic squiggles, both exotic (

) and everyday (&).

From the Library of Alexandria to the halls of Bell Labs, figures as diverse as Charlemagne, Vladimir Nabokov, and George W. Bush cross paths with marks as obscure as the interrobang (?) and as divisive as the dash ( ). Ancient Roman graffiti, Venetian trading shorthand, Cold War double agents, and Madison Avenue round out an ever more diverse set of episodes, characters, and artifacts.

Richly illustrated, ranging across time, typographies, and countries, Shady Characters will delight and entertain all who cherish the unpredictable and surprising in the writing life."

A charming and indispensable tour of two thousand years of the written word, Shady Characters weaves a fascinating trail across the parallel histories of language and typography.

Whether investigating the asterisk (*) and dagger ( ) which alternately illuminated and skewered heretical verses of the early Bible or the at sign (@), which languished in obscurity for centuries until rescued by the Internet, Keith Houston draws on myriad sources to chart the life and times of these enigmatic squiggles, both exotic (

) and everyday (&).

From the Library of Alexandria to the halls of Bell Labs, figures as diverse as Charlemagne, Vladimir Nabokov, and George W. Bush cross paths with marks as obscure as the interrobang (?) and as divisive as the dash ( ). Ancient Roman graffiti, Venetian trading shorthand, Cold War double agents, and Madison Avenue round out an ever more diverse set of episodes, characters, and artifacts.

Richly illustrated, ranging across time, typographies, and countries, Shady Characters will delight and entertain all who cherish the unpredictable and surprising in the writing life."