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Environmentalist John Francis, aka the Planetwalker, walked across America for 22 years, 17 of them in total silence.  He had decided to eschew all forms of motorised transport after observing the effects of the 1971 oil spill in San Francisco Bay, but then found he was arguing about this decision with everyone he met, until he decided to stop talking and start listening.  During this period, he says he discovered something he calls the ''.  He also completed three degrees.  John began talking again on the 20th anniversary of Earth Day in 1990, when he had finally completed his coast to coast walk.  For him, silence and walking are intertwined, and he still has periods of practising both.

Galya Morrell is a Russian artist and polar explorer who has led silent expeditions across the Arctic sea ice. She and three others travelled 4000 kilometres last summer in a small open boat, visiting the world's northernmost settlements in Greenland, and they spent much of this in total silence.  Galya is the child of Komi nomads, and she points out that northern people only speak when it's necessary.  Endless chatter would scare away the animals they rely on for food and warmth, and so for them, silence can be the difference between life and death.

Diarmaid MacCulloch is Professor of the History of the Church at Oxford University, and prize-winning author of Christianity: the First Three Thousand Years.  His latest book looks at the changing attitudes towards silence and sound in Christian worship and practice.  From the 'dumb idols' of the Old Testament, to monastic vows of silence, and contemporary shameful silences over abuse; he examines the 'divine wildtrack' that has accompanied Christianity over millennia.

Diarmaid MacCulloch proposes a tax on piped music in bars, restaurants and shops. He doesn’t believe this background noise enhances anyone’s experience of being in such places, and would like to make the proprietors pay for inflicting it on us! Similar ‘Sin taxes’ are applied to alcohol and tobacco in many parts of the world, so why not add this to the list?  Who knows, some business owners might abandon the practice altogether, resulting in a little more precious silence in a noisy world. 

What's the best structure for making political decisions - top down or bottom up? With Joseph Nye, David Graeber, Martijn de Liefde and Stephen Whitefield.