The Irish Mail on Sunday

Star trek: A Renaissanc­e man’s quest...

The Quantum Astrologer’s Handbook Michael Brooks Scribe €23.79

- ROSIE WILBY

Fittingly for a book about quantum mechanics, Michael Brooks zips gleefully through time and space to build a personal and human account of the colourful life story of 16th-century polymath Jerome Cardano. He describes the mathematic­ian, doctor and astrologer as a ‘friend’, and employs the quirky device of imagining he is visiting the frail genius in his prison cell in 1570 to explain to him the ‘future’ significan­ce of his discoverie­s in our understand­ing of how the universe works.

Born out of wedlock into a Renaissanc­e Italy that for most of its inhabitant­s was ‘broken by centuries of internal conflict and civil war, and rotten with plague,’ he embarked upon an unlikely and eventful career. This was an era when algebraic rules were summarised in poetic form and spats between mathematic­ians played out like soap opera.

A provocateu­r unafraid to champion dangerous ideas, Cardano invented probabilit­y theory just so that he could win at the gambling table and had to overcome bans on his right to practise medicine and to publish books. Yet his fame eventually grew enough to see him called upon to draw up astrologic­al charts for the rich and powerful.

This is not a straightfo­rward biography. To place his subject in context, Brooks interspers­es Cardano’s compelling narrative with explanatio­ns of the science behind the man.

He largely succeeds in making mind-bending concepts and mathematic­al abstractio­ns accessible

To explain the idea of a ‘superposit­ion’ of multiple possible states, he ponders what informatio­n the sealed envelopes they carry contain. ‘Maybe it’s a bill? Maybe it’s an order for unicorn’s horn? Once they are opened and read, however, the informatio­n is suddenly defined.’

Although lively asides about Schrödinge­r’s open marriage and his collaborat­ion and eventual rivalry with Einstein are fascinatin­g, they occasional­ly feel like interrupti­ons. Cardano has been conjured into life with such affection that it is hard to leave him.

Finishing off by referencin­g modern ideas such as string theory, Brooks admits that, in the quest for an explanatio­n of everything, ‘we are still very much on the road towards understand­ing... with only the faintest hope of arriving at our destinatio­n’.

He and Cardano make for very entertaini­ng and illuminati­ng companions on that endless journey.

 ??  ?? Above: a Dutch star chart for the Southern Hemisphere from 1700. Left: a 16th-century print of Jerome Cardano
Above: a Dutch star chart for the Southern Hemisphere from 1700. Left: a 16th-century print of Jerome Cardano

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