Scientists have linked an invasive mosquito to an unusual outbreak of malaria in Ethiopia. Anopheles stephensi , native to southern Asia, was first identified in Africa a decade ago in the Republic of Djibouti, which borders Ethiopia. It has since spread to at least four other countries in sub-Saharan Africa. Now, amid lingering questions about whether the insect’s...

Electric cars, wind turbines, and LED lighting all help keep the environment clean, but making them can be a dirty business. The high-performance magnets in motors and generators and the glowing phosphors in LEDs and flat screens all depend on substances called rare earth elements (REEs). And capturing REEs from the clay deposits in which many are found requires leaching agents that...

“A huge relief!” That’s how Luiz Davidovich, a physicist at the Federal University of Rio de Janeiro’s main campus and former president of the Brazilian Academy of Sciences, describes his feelings early Sunday evening when it became clear Brazilian voters had ousted populist far-right President Jair Bolsonaro and given his left-wing rival, former President Luiz Inácio...