Something dramatic happened about 500 million years ago called the Cambrian "explosion," during which an incredible diversity of life forms became preserved in the rock record. These fossils ...

At the University of California, Professor Charles Bernard Lipman, plant physiologist, took a chunk of pre-Cambrian rock. The piece came from Canada. Geologists considered it 100 to 200 million ...

Our ancestors had no problem with the idea that the sun would rise and set every day, providing light and warmth, forever.