Why do societies fail? With lessons from the Norse of Iron Age Greenland, deforested Easter Island and present-day Montana, Jared Diamond talks about the signs that collapse.
Civil wars and ethnic conflicts have brought the world incredible suffering, but Stefan Wolff's figures show that, in the last 20 years, their number has steadily decreased..
Strange landscapes, scorching heat and (sometimes) mad crocodiles await scientists seeking clues to evolution's genius. Paleontologist Paul Sereno talks about his surprising.
