You may think that humans only have five senses, but in fact we have many more.
Graham Easton delves into the extra senses that we take for granted, from our sense of balance to our sense of time.Graham cautiously steps into a Pain Research laboratory to discover why some things hurt more than others.
Plus he talks to The Torture King, the ex-Jim Rose circus performer, who threads skewers right through his bicep.
How does he control the pain?
Graham attempts to master balance by taking a lesson with The English National Ballet.
He has a dizzy moment in the balance lab at Charing Cross Hospital, and finds out why alcohol can put you in a spin.
But what happens if your balance systems goes permanently astray? Steve Geary has a rare condition which affects his sense of balance and means that he can hear his eyes squeak.
Graham looks at our body's sense of time.
Time is the most commonly used noun in the English language, and Dave Rooney, Curator of Timekeeping at Greenwich, explains why humans are so obsessed with timekeeping.
Even without looking at our watch, the brain's internal clock is incredibly accurate - correctly judging time intervals down to the millisecond.
However, this internal clock can go haywire, as Graham finds out under hypnosis.
Dr Mike Stroud has accompanied Sir Ranulph Fiennes on marathons and expeditions across the globe, from Antarctica to Africa.
He explains the intricate system we use to keep our temperature stable, even in extreme environments.
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This programme explores the bodily functions.
From eating to excreting, how do these inner senses tell us when we are full? Graham visits Dr Slack at his bladder clinic.