What's Happening?! (3/14)

Gary and Shannon search the web for the day's top trending stories. Here is "What's Happening?!" for Thursday, March 14th:

• What is Pi Day? Things to know about the holiday for an iconic math symbol
• Moderate to strong Santa Ana winds knock down trees, utility lines in Southern California
• Waymo to launch robotaxi service in Los Angeles, but no freeways
• Southern California students treated after eating 'magic' mushrooms