Researchers into olfactory memory, that curious nostalgia of the nose, have put it all down to the limbic system. I have read but cannot always parse the literature: the academics tend to lose me at the orbitofrontal cortex. But the

It was one of those stories that I sometimes pitched to make sure that I had money coming in: a throwaway that meant nothing to me, but which was curious enough that an online magazine would run it in return