While the cycles of life and death flowed on Earth 65 million years ago, unbeknownst to the living things on the surface, death lurks in the ionosphere.
With thousands of asteroids, comets and other near-Earth object buzzing by our planet, Jorge Ribas finds out how we can avoid the same fate as the dinosaurs.
The Earth is in the middle of its sixth mass extinction. Kasey-Dee Gardner finds out why they happen in the first place, and how we can save our planet.