Yeah, from the title, it would have to be an invention that has saved the life of virtually everyone on earth. Perhaps something that prevented a nuclear apocal

Yeah, from the title, it would have to be an invention that has saved the life of virtually everyone on earth. Perhaps something that prevented a nuclear apocalypse or the like. Or, at the very least, something that's saved the life of virtually every person likely to read BBC news. ;) As it turns out, it's the "black box" flight recorder. A great invention to be sure, but hardly of the scale just described.