"...The silica nanoparticles in STF move around like a liquid under normal conditions, but when struck lock together in a solid lattice-like structure that lasts only as long as the impact. A lightweight vest impregnated with STF has already been tested and has proved able to stop knife-stabs, fragmentation blasts, lower-power bullets and even hypodermic needles. At this level of development, it is suitable for staff such as police and prison officers. "
LINK2 from 2004
Video link here
HowStuffWorks has an article on nanotechnology.
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