A thermal image of human flatulence. The release of gas is red showing that it is warmer than the surrounding air, due to it being expelled rapidly at body temperature. Photo: Thierry Berrod, Mona Lisa Production/Science Photo Library
A thermal image of human flatulence. The release of gas is red showing that it is warmer than the surrounding air, due to it being expelled rapidly at body temperature. Photo: Thierry Berrod, Mona Lisa Production/Science Photo Library