Since the dawn of humanity, people have been on the move. Our ancestors' ability to travel across vast distances and adapt to different environments has been the key to our species' survival. But why do we migrate? When did passports first come into existence? And what impact have slavery, colonialism and war had on migration? In this 'everything you wanted to know' episode, Ian Goldin speaks to Danny Bird to answer listener questions about this age-old phenomenon.(Ad) Ian Goldin is the author of The Shortest History of Migration (Old Street Publishing, 2024). Buy it now from Amazon: https://www.amazon.co.uk/Shortest-History-Migration-Ian-Goldin/dp/1913083446/?tag=bbchistory045-21&ascsubtag=historyextra-social-histboty.The HistoryExtra podcast is produced by the team behind BBC History Magazine. Learn more about your ad choices. Visit podcastchoices.com/adchoices