The partial collapse of a waste dam at a Chinese state-owned copper mine in Zambia may have released 30 times more toxic sludge into the environment than previously reported, according to an independent evaluation of the disaster.
Over 15 years of fossil excavations in Tanzania and Zambia have revealed a vivid portrait of life before Earth s most devastating mass extinction 252 million years ago. Led by the University of Washington and the Field Museum, scientists uncovered .. ...