We all know how to add and subtract numbers, even if some of us avoid doing so by becoming good friends with our calculators. Performing addition and subtraction on numbers is one thing, but what about doing the same with light? Specifically, can we add and subtract photons, light particles, from each other? Does this seem possible? Photons are essentially light particles. Try taking two particles of matter, like a piece of your computer or even the air you are breathing, and combining them to make one particle. Only nuclear reactions do this, and to tell the truth, how easy is it for us to mimic what the sun does? Well we can combine two light particles together to make a single, different light particle.
