98.4 Degrees Fahrenheit. 37 Degrees Celsius. The wonderful regular temperature of our bodies. You can feel yourself as a self-regulating organism, permanently warm.
Energy keeps that warmth going.
Close your eyes and feel that warmth inside you. If it goes down a few degrees you will die, if you it goes up a few degrees you will die. Especially when breathing we can feel ourselves as energy. Our bodies use energy to drive all the chemical changes that happen within our cells and, ultimately, to make ourselves. Most of the warmth in our bodies is the energy of sunlight, stored in organic compounds by plants during photosynthesis, and released as useful energy by tiny cell-structures in each of our cells called mitochondria .