Resumen de Brazilian twist to tale of the first Americans
Humans lived in South America at the height of the last ice age, thousands of years earlier than people thought according to a controversial study. A team claims to have found 22,000-year-old stone tools at a site in Brazil, though other archaeologists are disputing the claim. Christelle Lahaye of Michel de Montaigne Bordeaux 3 University in France and colleagues excavated a rock shelter in north-east Brazil and found 113 stone tools. The team dated the sediments in which the tools were buried using a technique that determines when the sediments were last exposed to light.
