Lyall Watson

Air is traditionally 'thin,' but the more we learn about our atmosphere, the more substantial it becomes. In some places it is so filled with inorganic flotsam that it is almost thick enough to plough; in others, it has become so primed with the by-products of life that it comes close to being a living tissue in its own right.

We share our planet quite naturally with a permanent aeroplankton; a buoyant ecology too soft to hear, too small to see, but heavy with mood and meaning. Imagine being aware of all these airy inclusions - and you can begin to understand how it might feel to be able to smell really well.

Mushrooms are miniature pharmaceutical factories, and of the thousands of mushroom species in nature, our ancestors and modern scientists have identified several dozen that have a unique combination of talents that improve our health.