The discovery of a rib fragment from Baishiya Karst Cave greatly extends the presence of Denisovan hominins on the Tibetan Plateau. In-depth analyses of fossilized animal bones from the same site show that Denisovans made full use of the available animal resources.

A record spanning two millennia of Northern Hemisphere summer temperatures has revealed the extent to which 2023 was anomalously hot. The finding is a striking confirmation of warming since the pre-industrial period.

Ancient specimens of a previously undescribed species of four-limbed vertebrate fill a gap in the fossil record. The evidence offers surprises about where, when and how these ancestral relatives of humans evolved.

A compound has been discovered that increases the potency and duration of action of naloxone, a drug used to reverse the effects of opioid overdoses — possibly opening up another way to save lives.