Rainbows: Their Halachic and Hashkafic Implications

Rainbows in the view of Chazal, are they a good or bad? How are rainbows formed? When do we make a bracha on a rainbow and how often? Moonbows and double rainbows. What is special about the Noach Rainbow - weren't there rainbows before the flood?

Not staring at rainbows.

Delivered at the OU Israel Center, January 24th, 2018, 8 Shevat 2018