Of the five (traditionally accepted) senses, smell is definitely the one that gets overlooked.

But it can also be one of the most evocative.

If you’ve ever had a smell bring you back to a specific time or feeling you’ll know exactly what we mean by that.

But how does smell work exactly?

Luca Turin is a Biophysicist, Group Leader in Quantum Neurobiology at the Fleming Institute in Athens, and author of 'The Secret of Scent: Adventures in Perfume and The Science of Smell' - He joined Jonathan to discuss.