The Pluto Files
When the American Museum of Natural History’s Hayden Planetarium stopped calling Pluto a planet, director Neil deGrasse Tyson found himself at the center of a firestorm led by angry, Pluto-loving elementary
school students. What is it about this cold, distant, icy rock that captures so many hearts?
Watch a segment here
What killed off the dinosaurs? Some scientists believe the giant reptiles might have been taken down by
something almost too tiny to see.