On this day:

1911 Rediscovery of Machu Picchu, 15th Century Inca site in Peru

1923 The Treaty of Lausanne is signed between Turkey and the countries that formed the Allied Powers in the First World War

Born on this day:

1897 Amelia Earhart, American pilot, author

1945 Azim Premji, Indian businessman

Gone on this day:

2012 Robert Ledley, American scientist, invented the full-body CT scanner