In a preliminary report filed with state regulators, Pacific Gas & Electric says the Fly Fire may have started when a tree fell on one of its power lines. The fire started in Plumas County near Highway 70 -- and combined with the Dixie Fire late last month to form the largest wildfire currently burning in the state.With the rapid spread of the delta variant, and cases going up across the region, Bay Area heatlh officials are putting in place a mask mandate indoors again. The only counties that aren't mandating masks are Napa and Solano counties.COVID-19 cases are rising due to the highly contagious delta variant. So what makes this strain so much more contagious than others?Guest: Dr. Monica Gandhi, Infectious Disease Expert, UC San FrancicoMore California-based entertainment companies are requiring employees to get a COVID 19 vaccine. Now you can add Disney and Netflix to the list. Reporter: Benjamin Gottlieb, KCRWThe water in Lake Mendocino is dropping at an alarming rate, threatening supplies for communities along the upper Russian River. Water in the reservoir is below minimum storage levels, stressing drinking water supplies and fish that depend on the river. Reporter: Ezra David Romero, KQED The trillion dollar infrastructure bill moving through Congress includes language that could tax cryptocurrency companies. But crypto lobbyists are pushing back.  Reporter: Adhiti Bandlamudi, KQED  Learn more about your ad choices. Visit megaphone.fm/adchoices