[mikegi]

I don't think anyone knows what's really going on in sonoluminescence. Everyone seems to attribute it to their favorite pet theory: ZPF people claim its a Casimir-like effect, etc. Anyway, here's a link to an experiment done at LLNL:

http://www-phys.llnl.gov/N_Div/sonolum/sonolum_paper.html

If I were to bet on a technology that will have a large influence on our future, I'd place it on THz pulses:

http://utol.ecen.ceat.okstate.edu/THz%20Interactive%20tour/impulse.htm

[JerseyHighlander]

It's actually an age old communication tool used by shrimp...

exhibit A) http://www.sciencenews.org/scripts/printthis.asp?clip=%2Farticles%2F20011006%2Fclip%5Ffob3%2Easp