You're probably more familiar with his other work -- namely the Mona Lisa. But before Leonardo Da Vinci painted her enigmatic smile, he honed his skills sketching the most minute details of the world around him --- with a particular emphasis on birds and flight. Now, a rare opportunity to peek into the his journal which is written in a special backward code. It's on loan to the National Air and Space Museum in Washington from Italy. Curator Peter Jakab.moreless
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