We now know how insects and bacteria control ice
(PHYSorg.com Chemistry)

Contrary to what you may have been taught, water doesn`t always freeze to ice at 32 degrees F (zero degrees C). Knowing, or controlling, at what temperature water will freeze (starting with a process called nucleation) is critically important to answering questions such as whether or not there will be enough snow on the ski slopes or whether or not it will rain tomorrow.