A laser mediated by water waves

Ripplon laser through stimulated emission mediated by water waves

Among other materials in different forms necessary to sustain life on the pale blue dot in our solar system, water takes the highest accolades. 

Recently, scientists at the Faculty of Mechanical Engineering, Technion, 32000 Haifa, Israel reported, their findings in Nature Physics Nov 2016 fabricating a laser that uses water instead of crystals or others to sustain population inversion. The reported coherent excitation of capillary resonances were at kilohertz rates and therefore audible.

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Sources:

1. Carl Sagan - Pale Blue Dot
2. Nature Physics Nov 2016