Despite being just the size of an insect, tiny military weapons being developed by the military have the incredible power of hundreds of tons of TNT. In a new book, Louis del Monte, a physicist from Minnesora warns that these tiny weapons - dubbed'nanoweapons' - could lead to the most destructive world war yet which could spell the end for humanity. And this isn't just a long-term worry, as Mr del Monte has warned that the tiny weapons could render humans extinct by the end of the century. Nanoweapons have a 1 in 20 chance of causing human extinction by the end of this century. Terrorists could get their hands on nanoweapons through the black market as early as 2020.