From Sangha member Graeme:
 
Looking out into space can evoke feelings of awe and wonder, but so too can looking into our own bodies. This programme describes how our bodies are like mini planets, colonised by vast communities of microbes which we exchange with each other and with the environment. Two stand-out statistics which stuck in my mind: for every human cell in our bodies there are ten times as many microbial cells, and in a fifth of a tea spoon of saliva there are about 100 million bacteria!

BBC Radio 4 - A Natural History of Me!

www.bbc.co.uk

Thanks Graeme!