Carbon nano-tubes aren't just gorgeous, they might also save your brain one day. NASA's Jet Propulsion Laboratory is teaming up with a cancer center, City Of Hope, to develop a new minimally invasive type of brain surgery using carbon nanotubes. Researchers hope that these sharp-tipped tubes, 50,000 times narrower than a human hair, can deliver cancer-fighting agents directly to the brain. Tests in mice found the nanotubes were non-toxic and could deliver actual genetic information to the brain. Here's an image of the first "nanoknife," developed by NIST and University of Colorado in 2006. [ScienceDaily]