Scientists have made a fascinating discovery: through nerve cells in the hypothalamus mice are able to regulate their body temperatures, and save on their heating and air conditioning bills. These nerve cells contain a protein called TRPM2, which responded to heat after a battery of tests scientists performed. When mice with the protein and without the protein were subjected to heat, those with TRPM2 maintained a cooler temperature by 1 degree Celsius. Expect scientists to conduct more research on this in the future.