Famed investor insists he’s optimistic even after Berkshire Hathaway reported a $50 billion loss in the first quarter. Source

Despite being thrown into the public eye for most of her marriage to a country music star, Johnny Cash’s first wife was all but forgotten by Hollywood. But in a new documentary available for a limited time on Amazon, her daughters set the record straight. “My Darling Vivian” filmmakers Matt Riddlehoover and Dustin Tittle (the grandson of Johnny Cash) tell CBSN’s Reena Ninan the untold story of Vivian Liberto. Source

The Defense Advanced Research Projects Agency (DARPA), a stealthy Pentagon organization responsible for many technological breakthroughs, is rushing to find the three most potent antibodies to combat COVID-19. Catherine Herridge reports. Source

Tom Moore, a WWII veteran who prefers to be known as “Captain Tom,” became an international sensation for his record-breaking charity walk that raised millions to fight the coronavirus pandemic. “Captain Tom” now recently celebrated his 100th birthday. Charlie D’Agata reports. Source

The United Nations is warning the world of a looming food shortage as a result of the ongoing coronavirus pandemic. An expected 265 million people could face “acute food shortages” by the end of the year. Debora Patta reports. Source

North Korean state-run media reported Saturday that leader Kim Jong Un attended a factory opening. It’s his first public appearance in 20 days, while rumors ran rampant about his health. Ramy Innocencio reports. Source

President Trump retreated to Camp David on Friday evening for a working weekend. In the capital, however, there are remaining concerns about a lack of coronavirus test kits and protests of a deficient stimulus package. Nikole Killion reports. Source

With the coronavirus pandemic spiking demands for essential goods like face masks and ventilators, companies across the U.S. are changing lanes to meet those needs. Kris Van Cleave reports. Source

Growing numbers of meat factory workers become infected with the coronavirus, which could disrupt the food supply. If you subtract sick or worried meatpackers from the picture, what you will get is a shortage of meat. Dean Reynolds reports. Source

Here’s a look at the top stories making headlines on the “CBS Weekend News with Monique Ming Laven.” Source