Astrophysicist Neil deGrasse Tyson meets up with investigators trying to solve a 250-million-year-old murder mystery.

This installment of NOVA's science newsmagazine draws on a range of absorbing stories - from investigators trying to resurrect a 90-year-old virus to unlocking the secrets of ancient papyrus scrolls - and also profiles an innovative young roboticist, Cynthia Breazeal. Host and astrophysicist Neil deGrasse Tyson also meets up with scientists trying to solve a 250-million-year-old murder mystery. Is it possible that the biggest extinction in the history of life, which occurred millions of years before the dinosaurs were wiped out, could have been caused by global warming on Earth and not by impact from an asteroid or comet?