Image
A cloud of bubbles in deuterated acetone just prior to their collapse. The bubbles grow from around 10 nanometres to a millimetre in size in the acoustic chamber, before imploding to produce neutrons and light.
(Picture credit: Oak Ridge National Laboratory, Rensselaer Polytechnic Institute and Russian Academy of Sciences: Rusi P Taleyarkhan, J S Cho, C D West, R T Lahey Jr, R Nigmatulin and R C Block)