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This week, how more than one billion people living in India were given a unique digital ID during the world's largest biometric project. The Aadhaar scheme was launched in 2009 but it wasn't without controversy. Our guest, digital identity expert Dr Edgar Whitley, tells us about the history of ID schemes around the world.

Plus, the Spanish doctor whose pioneering surgery helped millions of people to get rid of their glasses and see more clearly. And why East Germany's thirst for caffeine in the 1980s led to an unusual collaboration with Vietnam.

Also, the story behind one of the most famous royal photographs ever taken \u2013 Princess Diana sitting alone on a bench in front of the Taj Mahal in 1992. The man who took the image tells us more.

And finally, how a Ghanaian athlete, Alice Annum, earned the nickname \u2018Baby Jet\u2019 after her medal-winning success in the 1970 Commonwealth Games.

Contributors:\nNandan Nilekani - former chairman of the Unique Identification Authority of India\nDr Edgar Whitley - digital identity expert at the London School of Economics\nDr Carmen Barraquer Coll \u2013 daughter of ophthalmologist Jose Ignacio Barraquer Moner\nSiegfried Kaulfu\xdf \u2013 East German official in charge of coffee production in Vietnam\nAnwar Hussein \u2013 royal photographer\nAlice Annum \u2013 retired Ghanaian athlete

(Photo: Scanning fingerprints for Aadhaar registration. Credit: David Talukdar/NurPhoto via Getty Images)