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Available for over a year

Is satellite navigation affecting our ability to find our way around using natural signs? Bridget Kendall explores the phenomenal computational power of the human brain to work out where we are and the navigational ability of migratory birds to fly thousands of miles. With Behavioural Ecologist Professor Tim Birkhead, Navigator and Explorer Tristan Gooley and Neuroscientist Professor Jennifer Groh. Photo: Birds flying in formation (Getty Images)