Researcher Silvano Vinceti, chairman of the Italian national committee for cultural heritage, says he's discerned the letters "LV" — "obviously Leonardo's initials" — on the Mona Lisa's right pupil.

Acrylic nails involve the application of artificial nail extensions made of acrylic plastic, which form the tip of the nails and are adhered to your natural nails. Acrylic nails can also be formed ...