Emma is one of my regular guest bloggers. I feel really thrilled about the possibility to post one educating post of this great blogger once a month over the next couple of months. Thank you so much, Emma, for sharing these great posts with us! If you would like to check out the previous guest posts, this amazing blogger wrote for me, head over here.
To a physicist, a lightbulb is a revolutionary science, and Thomas Edison is a hero. LEDs are especially revolutionary. Until recently, scientists only knew how to manufacture red and green LEDs. Red and green are cool colors and all, especially since they’re common holiday colors, but what scientists really wanted was white light. You get white light, and you can do anything with it. White light is composed of every single color (excepting brown—a pigment, and black—the absence of light), so if you have white light and a method of bending it to separate it into the individual colors, you can get every color of the rainbow and still more. The invention of a white LED would be an incredibly exciting discovery.