1. Everybody likes rainbows. It is one of the MOST BEAUTIFUL natural phenomena.
2. Few people know that Isaac Newton was the FIRST scientist to describe the rainbow.
3. We know seven colours of the rainbow but Newton SAW only five of them.
4. He COULDN'T see all the colours.
5. LATER he wished to compare the colours of the rainbow with musical notes.
6. Thus two more colours WERE ADDED by him to the description of the rainbow.
