Leonardo left us a wealth of writings within his notebooks. These notebooks were written in mirror writing to make them more difficult to read.
The topics covered in these encyclopedic notebooks include everything from geography to jokes, passing through philosophy, scientific observations, inventions, etc.
The menu on the left provides a sample of some of the subjects covered by Leonardo in his notebooks.
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Flip the Pages of Leonardo's Notebooks with the British Museum

More on Leonardo's Notebooks

For the Serious Student: Download a Vast Selection From Leonardo's Notebooks