Powerful sound waves

This has been reported all over the Internet but, for the sake of completeness, I'll link to the PhysOrg article on sonofusion here.

A team of researchers from Rensselaer Polytechnic Institute, Purdue University, and the Russian Academy of Sciences has used sound waves to induce nuclear fusion without the need for an external neutron source, according to a paper in the Jan. 27 issue of Physical Review Letters.