weather June 4, 2020 11:13 am Rainbows, What Causes Them? While there is no pot of gold at the end of a rainbow, there is a fascinating story behind each optical phenomenon. US & World Videos 1:07 How long will your fridge keep food safe during a power outage? 1:21 Watch the trailer for NBC's My New Favorite Olympian 3:53 A gas station meeting with Bill Walton changed this paralyzed young man's life forever 1:46 Heat waves getting hotter, longer, and more frequent because of climate change 1:03 More than 2,000 people buried alive in Papua New Guinea landslide, Government says