Researchers have successfully stored a single data bit in only 12 atoms. Currently it takes about a million atoms to store a bit on a modern hard-disk, the researchers from IBM say. They believe this is the world's smallest magnetic memory bit. According to the researchers, the technique opens up the possibility of producing much denser forms of magnetic computer memory than today's hard disk drives and solid state memory chips. "Roughly every two years hard drives become denser," research lead author Sebastian Loth told the BBC. "The obvious question to ask is how long can we keep going. And...