Learn About Gaps in the Rainbow and Spectrometry From PBS

Expand your mind and understanding of wavelengths from Be Smart on YouTube:

Over 200 years ago, scientists were looking at sunlight through a prism when they noticed that part of the rainbow was missing. There were dark lines where there should have been colors.

from Adafruit Industries – Makers, hackers, artists, designers and engineers! https://ift.tt/czIgGW1
via IFTTT