Experts believe the famous Mona Lisa artwork may be unfinished.
It's thought Leonardo da Vinci had a severe fainting episode leaving him with a "claw" hand, unable to hold a paintbrush.
A portrait of the artist shows his right hand wrapped in bandages.
Even though da Vinci drew with his left hand, he painted with his right too.
Rsearchers believe the injury may have forced him to leave many works incomplete.

Dream Theater returns to Dubai for 40th anniversary tour
Christina Aguilera to take the stage in Abu Dhabi
'Wicked' star Jonathan Bailey named 'sexiest man alive' by People magazine
Filipino pop star Rob Deniel to perform at Global Village this November
Charles Leclerc ties knot with long-time partner
Sheikh Zayed Festival opens to large crowds