Research in Africa found a one-time dose of an experimental drug protected adults against malaria for at least six months, the latest approach in the fight against the mosquito-borne disease.  Malaria killed more than 620,000 people in 2020 and sickened …

China’s third and final module docked with its permanent space station Tuesday to further a decadeslong effort to maintain a constant crewed presence in orbit, as its competition with the United States grows increasingly fierce. The Mengtian module arrived at …