Part 1 in the Light Series, this article answers the question, “what is sunlight?”, and takes the reader on a journey from the Sun’s core to the mitochondria in our cells.

Part 2 in the Light Series, this article explores how our bodies evolved and operate according to the light signals present in the environment.

Part 3 in the Light Series, this article provides an explanation of the biological effects and importance of full spectrum sunlight.