Very nice explanation!

• 00:00 Most people don't understand rainbows
• 01:08 Light refraction explained
• 08:20 How does a rainbow form?
• 13:10 Circular rainbows
• 15:14 Why are rainbows curved?
• 17:30 Why can’t you see a rainbow with sunglasses?
• 18:43 Why is it brighter underneath a rainbow?
• 20:44 Different types of rainbow
• 23:46 Invention of the cloud chamber