One of the major priorities of the body is to keep its core temperature even. If it changes by just two degrees either way from 37.5°C, the consequences can be dramatic and even fatal.

Tonight’s episode of this fascinating series is about survival and the amazing ways our bodies cope when under strain or threat, from maintaining a constant temperature, to ways in which we can control fear and why disgust is important.

Presenters Chris and Xand van Tulleken also learn what’s behind pain and reveal incredible facts about our amazing immune system.