The simple question of "why five" has puzzled scientists from multiple fields, and the answer still isn't entirely clear.

Scientists uncover a 65-million-year-old chinchilla-sized mammal, offering clues to life after the dinosaur extinction.

We now know just how the earliest land plants, ancient algae, conquered terrestrial Earth hundreds of millions of years ago ...

Netflix documentary Secrets of the Neanderthals tries to decode who the Neanderthals were and what happened to them ...