Imagine a world where furry mammals scuttle under the feet of gigantic dinosaurs, not yet destined to rule the Earth. It’s a ... branch of ancient life—egg-laying reptiles.

Researchers Surprised to Find That a 200-Million-Year-Old Egg-Laying Mammal Did Not Become Extinct Over the course of several ...

And the crust is this layer of solid rock that we live on. It's very thin. If Earth was the size of an egg, the Earth's crust would be as thin as the eggshell. And like an eggshell, the crust has ...