https://phys.org/news/2022-12-toughest-material-earth.html "The toughness of this material near liquid helium temperatures (20 Kelvin, -424 Fahrenheit) is as high as 500 megapascals square root meters. In the same units, the toughness of a piece of silicon is one, the aluminum airframe in passenger airplanes is about 35 , and the toughness of some of the best steels is around 100. So, 500, it's a staggering number..."