Nanotubes are the stuff invisible dreams are made of, producing batteries
, tiny chips
, and in this case, invisible tightropes. Nicola Pugno of the Polytechnic of Turin in Italy has figured out a way to spread invisible nanotubes 5 micrometers apart that he says could support an entire human. The resulting "cable" would measure 1 centimeter in diameter and weigh just 10 milligrams per kilometer. So, what would we do with this ultra-strong, invisible cable? Support things that weigh about as much as humans do, naturally. Really, though, this means that super-strong, super-small cables are coming, and architecture could be changed forever. Other uses abound, for sure, but we'll leave that speculation to the science guys.