LISTEN 
Clare Balding joins a hiking group for ex-pat American and international spouses.
Wed 19 Oct 2011 20:45 BBC Radio 4
Science journalist and blogger Ed Yong explores the physical and philosophical implications of being host to billions of microbes.
He reports the latest science showing how the bacteria we come into contact with can profoundly affect our lives - from the ability to digest different foodstuffs to our susceptibility to asthma, diabetes and even stress and anxiety.
And, he asks whether he should be seen as a human, or a universe of bacteria in a "human shaped sack"?
Four Thought is a series of talks which combine thought provoking ideas and engaging storytelling.
Recorded in front of an audience at the RSA in London, speakers take to the stage to air their latest thinking on the trends, ideas, interests and passions that affect our culture and society.
Producer: Giles Edwards.
BBC Radio 4Wed 19 Oct 2011 20:45 BBC Radio 4
Explore some of the best programmes from Radio 4's Four Thought
Four Thought talks include stories and ideas which will affect our future, in politics, society, the...
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