Vanishing cultures mirror the yesterdays of man -- Lapps in a modern world face timeless realities -- Bushmen: Gentle Nomads of Africa's harsh Kalahari -- Nilgiri peoples of India: An end to old ties -- Mysterious "Sky People": Japan's dwindling Ainu -- Australian Aborgines: Blending past and present -- Indomitable Eskimo: Master of a frozen world -- Indians of Central Brazil: Struggle to survive -- Hopis: "Peaceful Ones" confront the 20th Century -- New Guinea's fierce Asmat: Heritage of headhunting.