The researcher said the "Mona Lisa's" smile was originally slightly wider than it appears today, and, in fact, so was her entire face. Leonardo kept this painting with him for more than a decade ...

The Mona Lisa, also known as La Gioconda, is an oil painting of a Renaissance ... he held the portrait, allowing no-one, not even himself, a glimpse of her face. But by 1913, the Italian national ...