It's well known that insects and other lower animals have an elaborate language of scent signals giving smell instructions for anything from the finding of a mate to where to go for food, and even population control. But now scientists are finding evidence for such a system in higher animals and even man, and the question this programme sets out to answer is just how much does man still use this kind of signal. Narrator PAUL VAUGHAN
Editor PETER GOODCHILD Producer MICK RHODES
Making scents of smells: page 17