Tinkerer Neil Vocce says he’s perfected a means of walking on air. He modeled it after the shoes that let you run on water if you slap the water hard enough. He said he figured if an airplane could fly, then air should be solid enough to walk on with the right shoes and the right technique. If you can’t find any information about Vocce’s invention, it might be that vested interests want to keep our feet on the ground.