In my Calculus class today we were discussing thermodynamics, and one person claimed that he has thought of a way to violate the laws of thermodynamics. His proposal goes like this.
Water expands when it freezes, so as energy is released from water, and it freezes, the expansion could be harnessed to give more energy then you started with, so you get the energy that is released from the water, in addition to the energy generated by the movement of the water as it freezes.
I don't have enough of a background in physics to counter this, could someone else help me to understand how this fits in with thermodynamics?