Replica of a Denisovan molar, originally found in Denisova Cave in 2000

Denisovans and Neanderthals Interbred in a Giant Cave

New findings shed light on how humans' ancestors interbred, but the Denisovans remain quite mysterious.
Gypsum crystals of the Naica cave.

Exploring Mexico’s Otherworldly Cave of Crystals

The Cave of Crystals is a massive cavern, filled with gigantic gypsum crystals, larger than any crystals ever before seen on Earth.

Neanderthals Were Smarter Than You Think

Neanderthals, suggest recent studies, had complex societies and even some culture.