Mirror-image cursive encompassed 13,000 pages of notes and drawings. The topics compose a mini encyclopedia. Detailed studies of flying machines, plants, architecture, babies, emotions, and drapery, are a sampling of the journals Leonardo da Vinci wrote. Many of his studies are written in a manner to make publishing easy. This genius is human; the journals include lists of debtors and weekly groceries. 

In 1994, Bill Gates paid over $30M for 18 sheets of paper that contain 72 pages of da Vinci's journal, known as the Codex Leicester. I haven't journaled flying machines, but I have journaled grocery lists, so I have hope for...