“In the early 1800s, a German physicist named Joseph von Fraunhofer noticed something strange. He was looking at sunlight as it passed through a prism and spread out on a wall when he realized part of the rainbow was missing. All throughout the spectrum from red to violet, there were...
“In the early 1800s, a German physicist named Joseph von Fraunhofer noticed something strange. He was looking at sunlight as it passed through a prism and spread out on a wall when he realized part of the rainbow was missing. All throughout the spectrum from red to violet, there were...