Ed Sheeran surprised a fan singing one of his songs by joining her on stage for an impromptu duet of “Thinking Out Loud” at a Humane Society fundraiser. CBSN’s Vladimir Duthiers and Elaine Quijano watch the sing-along. Source

Nick Dietz compiles some of the latest and greatest viral videos, including a big brother emboldening his baby sister and two guys that can’t seem to figure out how a Frisbee works. To see these videos in their entirety, click HERE. Source

The case of William Bruce, who murdered his mother in a psychotic rage, highlights debate over treatment for the mentally ill. Source

After being accused of lying about her race, Rachel Dolezal resigned as head the NAACP chapter in Spokane, Washington. CBS News correspondent John Blackstone reports on her decision to step down. Source

A 12-year-old girl and a teenage boy lost limbs on Sunday following separate shark attacks on a North Carolina beach. Though the beach remained open Monday, beachgoers were wary of entering the water. CBS News correspondent Elaine Quijano reports. Source

Former Florida Governor Jeb Bush officially entered the race for the Republican nomination for president Monday. During his speech, Bush leaned heavily on his accomplishments as governor. CBS News correspondent Nancy Cordes reports. Source

An organization called “22 Too Many” uses online resources to prevent military veterans from committing suicide. CBS News correspondent Chip Reid spoke with its founder about its mission. Source

Stanford holds off Arizona to win the women’s NCAA Tournament, giving coach Tara VanDerveer her first title since 1992. Source

Nick Dietz compiles some of the latest and greatest viral videos, including the reason why dining is not allowed on roller coasters and a rescued baby manatee drinking milk from a bottle. To see these videos in their entirety, click HERE. Source

It’s the Stradivarius of theater organs, and every weekend for the past 47 years, Bill Field has played his Mighty Wurlitzer for audiences at the Old Town Music Hall in El Segundo, California, providing them with a trip back in time. Conor Knighton reports. Source