No civilians can by grenade launchers in the US, its just a $200 tax stamp.

Link
http://www.nottingham.edu.cn/en/news/scientific-breakthrough-university-invents-heat-regulating-building-material.aspx

and article

http://www.sciencedirect.com/science/article/pii/S0196890410003729

That's funny I thought they were looking for gold and spices not exploring as an end in itself?

Mechanical vibrations are used to measure molecular relaxations in polymers (rheology and dynamic mechanical analysis). The devices I am most familiar with have an upper limit of about 100 hz, however, by controlling the temperature high frequencies can be effectively measured.