Historian Peniel Joseph says there have been three periods of reconstruction in American history. The third period, he says, is happening right now. Associate producer Julia Corcoran introduces this conversation with Joseph. Then, Danish photographer Soren Solkaer first saw mysterious patterns in the sky, technically called murmurations, when he was a child. He started photographing birds flying above the northern stretches of the Wadden Sea, which Denmark residents called the Black Sun. Senior producer Karyn Miller-Medzon introduces Solkaer's conversation with host Robin Young. And, Chicago music venue the Metro Club celebrated 40 years in operation in 2022. In its 4 decades, it's been a haven for punk, rock and metal music, hosting big-name acts like Black Flag and R.E.M. Producer Chris Bentley spoke to the club owner and long-time patrons.