Jamie Bartlett is a journalist, author and television presenter whose last book "The Dark Net: Inside the Digital Underworld" introduced us to the disturbing corners of the dark web. There he became friends with trolls, hackers, drug dealers, pornographers, political extremists, crypto-anarchists and vigilantes. His new book "Radicals" takes us into the minds of people who dare to be different: the innovators, disruptors, idealists and extremists whose secretive and influential movements include: techno-futurists questing for immortality, far-right groups looking to close borders, militant environmentalists, autonomous cooperatives, and psychedelic pioneers.