An interesting scientific fact: If an asteroid didn't wipe out the dinosaurs 66 million years ago, our small mammals ancestors would still be hiding under the ground and on the top of trees. There would be no human apes. We would not exist.

New Fossil Discovery Offers Glimpse into the Day the Dinosaurs Died | NOVA | PBS

A mass of fossilized fish, uncovered in North Dakota, appear to preserve the catastrophic fallout of the asteroid impact that wiped out the dinosaurs.