This trove of mammal fossils paints a timeline of life after the dinosaurs died.
Stunning new mammal fossils were hiding in plain sight.
The Denver Basin preserves a pristine record of ecosystem recovery.
Plants can help us understand how life rebounds after a mass extinction.
Getting to know Neptune, the outer-most planet.
Neptune has swirling clouds and strong winds. Can scientists figure out why?
Jupiter is more than the biggest planet in our solar system—it's also the oldest.
Jupiter formed long before most other planets around it did.