Impossible inventions

When Leonardo da Vinci invented wild contraptions such as a tank, a car, a paraglider, and a helicopter in the late fifteenth century, he was seen as a madman. Today we know that he was a genius who was well ahead of his time. This book tells the history of ancient and modern inventions--some fun, some innovative, some failed, and some disastrous, but all the product of the power of the human imagination.