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New research on how diesel fumes affect asthma sufferers was carried out in a real-life setting, not a laboratory. We look at what the experiment involved and the findings.

Also on the show, a look at how the increase in Cambodian mothers breastfeeding their babies has led to a third fewer children dying, and the Indian women donating breast milk to hospitals; a guide to coughs and honey as a medicine; the Chinese children who had to move far from home after a massive flood – how are they coping with their new lives?