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.

UAE National Orchestra holds debut concert
Filoni named president of 'Star Wars' studio Lucasfilm as Kennedy exits
Prince Harry to give evidence in lawsuit against Daily Mail next week
'Demon Slayer' movie director aimed to deliver nonstop demon battles
Grammy-nominated Edwin McCain brings tour to Dubai for first time
Chase Infiniti and Robert Aramayo among Rising Star nominees at BAFTAs