He explains that when light refracts to form a rainbow it refracts in two different rays, light and dark.
Gilbert Baker from San Francisco created the first rainbow flag. The original flag had nine colors for all inclusivity but was later removed to make it easier to produce.
Isaac Newton discovered that a ray of light is divided by a prism into two colors, the rainbow color spectrum and then white light.
A German Monk named Theodoric discovered the actual scientific reasons on how rainbows form.