Da Vinci document discovered in French library

A "fragment of paper with brown scrawls" discovered recently in a public library in the French city of Nantes was not just trash. It was a coded document written by Leonardo da Vinci. (photo)

The document was found among a collection of 5,000 manuscripts donated to the library by Pierre-Antoine Labouchere in 1872, and it requires a mirror to read. It has yet to be deciphered.