Mysteries of some atmospheric halos remain unexplained after 5,000 years

Mysteries of some atmospheric halos remain unexplained after 5,000 years

New paleomagnetic research suggests Earth’s solid inner core formed 550 million years ago and restored our planet’s magnetic field, just before the explosion of multicellular life on Earth, and avoiding a Mars-like fate

Over 60 million years ago, penguins abandoned flight for swimming. Here’s how.