This small Leonardo da Vinci sketch of a bear expected to sell for $16 million

One of eight sketches by Leonardo da Vinci still privately owned, this 8-inch square sketch of a bear will go up for auction next month. It's expected to sell for between $11 and $16 million. That's twice the price that the most expensive Leonardo sketch sold for twenty years ago—'Horse and Rider' for $11.2 million. — Read the rest