If you want more insight into the differences between invention and innovation, check out the Museum of Unworkable Devices! It includes many perpetual motion machines, along with other ideas that will never work. Best of all, it has very good explanations of why the designs are futile. Great stuff!

(that’s a picture from the site of a beautiful perpetual motion machine designed by David Jones – who knew it wouldn’t actually work)

(Bruce Sterling doesn’t really need any links from me for his great blog to grow bigger, but I’ll give him a hat tip anyway)