It's one of those books where you're absolutely certain the publisher missed a page in the printing. Leonardo's sheep, George, has a problem: when it rains he shrinks. Leonardo tries to construct new inventions to save George the trouble of shrinking and finally develops an umbrella which whisks the sheep away into the sky. The plot ends with this last sentence:

So he swiftly gathers up his notes, his compass, his carpenter's meter, and of course his eraser, and begins to calculate some more...With or without a machine, he will find his little George!

So we're not really sure what happened to his magical sheep.

The last few pages are photographic reconstructions of Leonardo's inventions that are mentioned in the book, which is really cool, and 5 paragraphs addressing certain aspects of the real Leonardo DaVinci (Who was Leo?, In what way was he a genius?, What did he invent?, How do we know about all these inventions?, What about George's umbrella?, and Where can Leo's inventions be seen today). I just wished the story wasn't so painful.