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The 2009 attempt to give all Indian citizens a unique digital ID
In 1963, Dr Jose Barraquer Moner performed the first eye surgery to fix short-sightedness
A thirst for caffeine led to an unusual global collaboration in the 1980s
In 1990, the Channel Tunnel between Britain and France was connected
Ordinary people saw inside the home of Ukraine’s ousted president in February 2014
In 1936, Dale Carnegie wrote the self help book - How to Win Friends and Influence People
The study aimed to test whether 'ordinary' people were capable of committing evil acts
One man has dedicated his life to finding the victims of Paraguay's dictatorship
Oliver Tambo returned to South Africa in 1990 after 30 years in exile