A mother's love can be deafening . . .

Isaac is Hannah’s entire world. She knows that her son is gifted, and that those gifts make him vulnerable. To keep him safe, she spends every waking moment by his side. If she lets her guard down, lets him out of her sight, lets him show what he’s capable of, he will be taken from her.

When the Soundfield arrived twenty years ago, the world changed with it. Now, people are forced to live at night due to the deadly heat of the day, food and water are scarce, and everyday life is punctuated by the constant and disconcerting hum from the Field. A brilliant scientist, Hannah spent her early career working on the enigma of the Soundfield, looking for answers; now, resigned, she has focussed all her energies on keeping Isaac living, not just alive.

To do so, she will have to lie to the people she knows and hope she can trust the ones she doesn't. Because the only thing more dangerous than her lies, is the truth of what she has done.

This book constitutes the refereed proceedings of the 15th Conference on Computability in Europe, CiE 2019, held in Durham, UK, in July 2019. The 20 revised full papers presented were carefully reviewed and selected from 35 submissions. In addition, this volume includes 7 invited papers. The conference CiE 2018 had the following six special sessions: computational neuroscience, history and philosophy of computing, lowness notions in computability, probabilistic programming and higher-order computation, smoothed and probabilistic analysis of algorithms, and transnite computations.

In October 2010, Ai Weiwei's Sunflower Seeds appeared in the Turbine Hall in the Tate Modern. Six months later, he was arrested in China and held for over two months in terrible conditions. The most famous living Chinese artist and activist, Ai Weiwei is a figure of extraordinary talent, courage and integrity. From the beginning of his career, he has spoken out against the world's greatest totalitarian regime, in part by creating some of the most beautiful and mysterious artworks of our age, works which have touched millions around the world. After Weiwei's release, Barnaby Martin dodged the secret police to interview him about his imprisonment and his intentions. Based on these interviews and Martin's own intimate connections with China, Hanging Man is an exploration of Ai Weiwei's life, art and activism. It is a rich picture of the man and his beliefs, what he is trying to communicate with his art, and of his campaign for democracy and accountability in China. It is a book about courage and hope found in the absence of freedom and justice. 'Hanging Man is the most detailed, comprehensive and eloquent English-language account of what happens these days to Chinese political prisoners . . . [an] invaluable book' Literary Review