Wow, a lot of work went into this.

Mona Lisa, the mysterious woman immortalized in Leonardo da Vinci's 16th century masterpiece, had just given birth to her second son when she sat for the painting, a French art expert said on Tuesday.The discovery was made by a team of Canadian scientists who used special infrared and three-dimensional technology to peer through hitherto impenetrable paint layers on the work, which now sits in the Louvre museum in Paris.