Did dinosaur blood run cold, like a lizard, or warm, like a bird? It’s a topic that’s long divided paleontologists. An analysis of fossilized dinosaur egg shells suggests it’s the latter. By ...

To understand how species evolve, researchers need to crack open this black box of evolution and investigate natural selection in wild populations.

Fossilized eggs crack open the mysteries of the past ColorBlind/Digital Vision/Getty Images Eggs are helping paleontologists and archaeologists unlock Information about the past.

To understand how species evolve, researchers need to crack open this black box of evolution and investigate natural selection in wild populations.

Using high-resolution 3D images and inspecting the inside of the eggs, the researchers were able to build a model of what the eggs looked like during different stages of incubation.

World News Fossilized eggs crack open the mysteries of the past Eggs have been laid on land by birds, reptiles, dinosaurs and a few oddball mammals for more than 200 million years.

And humans have been using some of these eggs as a nutritious source of food, and their shells as bowls, bottles and jewelry for most of our history on the planet. Though they’ve often been ...