Once used by vets to anesthetize elephants, carfentanil is now an extremely dangerous illicit drug often disguised as an oxycodone tablet—and it's 100 times stronger than fentanyl.

Much of our understanding of Earth's past is derived from stratigraphic records exposed in rock outcrops or recovered from drilled cores. These records span immense time intervals, from thousands to ...

This paper examines whether Chinese development finance is associated with faster progress toward Millennium Development Goal style targets in low- and middle-income countries. We combine AidData’s ...

A draft assessment of the health of nature in the United States is grim but shot through with bright spots and possibility. By Catrin Einhorn An unusual outbreak of wildfires in city parks gave ...

Objectives To evaluate whether type 2 diabetes mellitus (T2DM) presence and severity are associated with differences in global and domain-specific cognitive function among US adults, using ...