Carbon nanofibres mimic asbestos
http://news.theage.com.au/world/nanofibres-lead-to-precancer-symptoms-in-mice-study-20080521-2gm4.html Not really a surprise, most fine fibres cause problems of one sort or another. Most of the problems with Asbestos have been due to poor handling practices at times when it was believed NOT to be dangerous. Hopefully, the high value of nanofibre products will lead to better care being taken, but imagine the aftermath of a space elevator accident with massive contamination...