It’s hard to argue that bicycles aren’t super handy. They get you from point A to B in a jiffy with little effort. Since these machines are so simple and convenient, why not use them for ...

Idaho has built his very own human powered elevator as a means to gain access to his recently constructed treehouse. Schlussler came up with the idea of converting an old bicycle and pulley system ...

The build takes a pretty ordinary bicycle, and replaces the rear brake disk with a large pulley for a toothed belt, which drives a smaller pulley, and through a shaft another set of pulleys to the ...

Some of the others are more reasonable, like a dog-wheel powered bike (don't say you haven't thought about it), which PopSci explains in the gallery The so-called "Poochmobile," invented by eighty ...