Long-lost Da Vinci code discovered in French library

A coded fragment of writing by Leonardo da Vinci has been discovered in a library in Nantes in western France after languishing in an archive for nearly 150 years. Experts have yet to decipher the text because it is written right to left in Leonardo's trademark mirror-writing style and the words are arcane 15th century Italian and other languages. The artist wrote most of his notes back to front, from left to right and reversing each letter, only using standard writing if he intended documents to be read by others. The yellowed scrap of manuscript was among 5000 documents donated to Nantes in 1872 by a wealthy collector