What do you get when you cross acoustics and lasers? The answer is a SASER (Sound Amplification by Stimulated Emission of Radiation). This has been done before but there is a new implementation out. Work was by University of Nottingham in the UK and the Lashkarev Institute of Semiconductor Physics in the Ukraine and is in the 2 June 2006 edition of Physical Review Letter.
(Hat tip: Physics News Update)