Sunglasses

Electromagnetic waves are similar to ocean waves. We use them every day, and without them, the world we know would not exist. They range from Gamma rays to X-Rays to Ultraviolet rays to Visible Light Waves, even longer Infrared Waves, Microwaves to Radio Waves which can measure longer than a mountain range. This spectrum...

Why Do We Need Sunglasses? As a pilot it is easy for me to understand, but everyone who is outdoors under any conditions shoud wear a good pair of sunglasses to protect their eyes.