Ounce-for-ounce, carbon nanotubes are 117 times stronger than steel and 30 times stronger than Kevlar®, according to assistant professor Stephen Cronin at the University of California. Cronin tested carbon nanotubes of various lengths and widths, discovering that they could be stretched twice as far as previously thought possible before breaking. His findings, published in the journal ACS Nano, establishes a new lower limit for the strength of the mighty carbon nanotube.