Things aren’t always as they appear. Take for instance something as commonplace as grass. What color is most grass? The non-thinking immediate response would be ‘green’. While that answer has merit, it’s not quite accurate. Grass does indeed appear to be green, but why? The answer is best explained by understanding light, also known as electromagnetic waves. Electromagnetic waves include radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays. Optical waves are the waves that can be seen with the human eye. The reason grass appears to be green is that it absorbs both red and blue light while reflecting green and yellow light. Our eyes are actually seeing this reflected light, which is why grass appears to be green.