It's a mystery on a global scale: five times in Earth's past, life has been nearly extinguished, the vast majority of plants and animals annihilated in a geologic instant. What triggered these dramatic events? And what might they tell us about the fate of our world? Joins scientists around the globe as they unravel the mysteries of two of the most dramatic mass extinction.

Sixty-six million years ago, a gigantic asteroid slammed into Earth, wiping out the dinosaurs. There's strong evidence of the asteroid impact, but no fossils of a dinosaur killed in the event have ever been found. Now, at a dig site in North Dakota, scientists have uncovered a wealth of fossilized creatures that could reveal a more detailed picture of the devastating day the asteroid hit. Following a trail of remarkably well-preserved fossils, including...

Don't let the pigeon stay up late: One stubborn pigeon is not going to bed -- Knuffle Bunny free: Trixie and her family set off to visit her grandparents, but Knuffle Bunny has other ideas -- Edwina: Everyone loves Edwina except for a know-it-all who tries to convince everyone that dinosaurs are extinct.