Coral reefs are not just beautiful; they are also home to over a quarter of all marine life and are crucial to human societies around the globe. But as the climate changes and oceanic heatwaves become commonplace, corals are bleaching, and reefs are dying off. Now, marine biologists worldwide are teaming up to counteract this catastrophe with a technique called assisted evolution. Follow scientists as they attempt to crossbreed heat-resistant corals and even transplant corals' algae in a race to save the coral reefs from extinction. 

The cause of the infamous Hindenburg crash has baffled experts for over 80 years, with theories about the airship's fire ranging from deliberate sabotage to a spark generated by the stormy conditions in which it landed. But new, never-before-seen amateur footage of the crash has surfaced, showing the airship's final seconds from a fresh angle and in unrivaled clarity. Taking clues from the footage and other sources, NOVA leads a fresh investigation at a leading scientific lab with eye-opening experiments that point to a final solution of the mystery.