HONG KONG (Reuters) – Archeologists have uncovered evidence suggesting that early humans braved cold temperatures to occupy highlands in Papua New Guinea 50,000 years ago in search of food. Working on five archeological sites about 2,000 meters above sea level, researchers from Papua New Guinea, Australia and New Zealand found charred nut shells from the pandanus tree and stone tools which carbon dated back to 50,000 years ago. "This is the first evidence of people at such a high altitude at the earliest of time," said anthropology professor Glenn Summerhayes at the University of Otago in New Zealand. Experts have...