NOVA takes you inside the operating room to witness organ transplant teams transferring organs from donors to recipients. Meet families navigating both sides of a transplant, and researchers working to end the organ shortage. Their efforts to understand organ rejection, discover ways to keep organs alive outside the body, and even grow artificial organs with stem cells, could save countless lives.

Climb with volcano experts to the summit of Nyiragongo, a highly active volcano in the Democratic Republic of the Congo and one of the world's least studied. Twice in recent memory it has erupted, devastating Goma, a neighboring city of 1 million people. To investigate when it might erupt next, volcanologists descend into its crater toward its bubbling and seething lava lake to deploy sensors and monitor the volcano's activity.