NASA unveils initial plan for multibillion-dollar telescope to find life on alien worlds
Habitable Worlds Observatory would be designed for robotic servicing
Illegal mining has muddied tropical rivers worldwide
Silt overload and mercury pollution endanger river ecosystems—and the people who depend on them
FDA approves new antibody to slow Alzheimer’s disease, even as safety concerns linger
Agency warns about brain swelling and bleeding on drug’s label, but imposes few restrictions on lecanemab’s use
