1.   His primary evidence was unusually large amounts of the rare metal iridium found worldwide in sediments laid down about the time of the dinosaur extinction.

2.   Muller had the dinosaur extinction in mind when he proposed the current research.

3.   Pathfinder may find evidence of life on Mars, but the disappearance of intelligence on Earth over this heavyweight fight was the magnitude of dinosaur extinction.

4.   The Chicxulub crater was big enough to account for the dinosaur extinctions, and its age was exactly right.

5.   The coverage of the meteor impact theory of dinosaur extinction is fascinating, narrated by scientists with remarkably fine animations.

6.   The link between the two schools of dinosaur extinction is being constructed from well-known scientific principles.

7.   They have also found buckyballs containing similar types of gases in sediments dating from the dinosaur extinctions.

8.   This may have some far-reaching implications, offering a possible explanation for dinosaur extinction.

9.   By the time of the dinosaur extinction, some of the continents were separated and moving apart.

10.   The dinosaur extinction has been associated with the collision on Earth of a massive meteor or comet.