News update on the new Omicron variant now in many countries across the world. Plus Hannah Fisher reports on the science of smell and conditions other than Covid where it can be lost. Holly Bradshaw, Olympic pole-vaulter turned psychology researcher discusses the post-Olympic blues with Karen Howells, Senior Lecturer in Sport and Exercise Psychology. And could Viagra be a candidate drug for Alzheimer's disease?

This week’s guest is Mathew Fox, Professor of Global Epidemiology from Boston University.

Presenter: Claudia Hammond

(Picture: 3D illustration of coronavirus. Credit: Maksim Tkachenko/Getty Images.)