Helen Duncan – known since childhood as ‘Hellish Nell’, for her uncontainable nature – was one of the most popular mediums of the twentieth century, holding seances around the country where she was believed to manifest the spirits of the dead.

What happens when we die? It was the question of the age for a generation which had endured one world war and now was living through another. Mrs Duncan’s seances offered an answer. But when she started foretelling naval disasters, she also attracted the unwelcome attention of the secret service. And so just weeks before the Normandy landings, absurdly, anachronistically, she was prosecuted for witchcraft and jailed. Was Nell a conjurer, a martyr or a security risk?

Hellish Nell was first published in 2001 to widespread acclaim. It remains in this revised edition a fascinating window into the unsettled spiritual and psychological mood of the times: a sensational tale of spectacle, credulity and cruelty, and of Britain’s last witch.

Is flying dangerous? How much do the world’s cows weigh? And what makes people happy?

From Earth’s nations and inhabitants, through the fuels and foods that energize them, to the transportation and inventions of our modern world – and how all of this affects the planet itself – in Numbers Don’t Lie, Professor Vaclav Smil takes us on a fact-finding adventure, using surprising statistics and illuminating graphs to challenge lazy thinking. Smil is on a mission to make facts matter, because after all, numbers may not lie, but which truth do they convey?

‘Smil’s title says it all: to understand the world, you need to follow the trendlines, not the headlines. This is a compelling, fascinating, and most important, realistic portrait of the world and where it’s going’ Steven Pinker

‘The best book to read to better understand our world. It should be on every bookshelf!’ Linda Yueh

‘There is perhaps no other academic who paints pictures with numbers like Smil’ Guardian

Vaclav Smil is Distinguished Professor Emeritus at the University of Manitoba. He is the author of over forty books on topics including energy, environmental and population change, food production and nutrition, technical innovation, risk assessment and public policy. No other living scientist has had more books (on a wide variety of topics) reviewed in Nature. A Fellow of the Royal Society of Canada, in 2010 he was named by Foreign Policy as one of the Top 100 Global Thinkers. This is his first book for a more general readership.