Within Reason Alex J O'Connor

Rory Stewart is a former UK Government minister, MP, and deputy governor in Iraq following the western invasion. He walked on foot for two years across Afghanistan, Iran, Pakistan, India and Nepal in 2002. He was a private tutor to both Prince William and Prince Harry. He now co-hosts The Rest is Politics with Alastair Campbell, one of the UK's most popular shows.

A.C. Grayling is a British philosopher and author. In 2011 he founded and became the first Master of New College of the Humanities, an independent undergraduate college in London.

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Sam Harris is a neuroscientist, philosopher, New York Times best-selling author, host of Making Sense, and creator of Waking Up.

Carlo Rovelli, an Italian theoretical physicist, is known mainly for his contributions to research in the field of quantum gravity. He is the author of Seven Brief Lessons on Physics, The Order of Time, and White Holes, amongst other works.

William Lane Craig is a Christian philosopher and public speaker, who today makes his third appearance on Within Reason. We discuss why Richard Dawkins refuses to debate him, and whether Old Testament slaughter can be justified.