The First Americans: What Do You Do When You Realize EVERYTHING You've Been Taught Is a Lie?

bbc |  The programme, Ancient Voices, shows that the dimensions of prehistoric skulls found in Brazil match those of the aboriginal peoples of Australia and Melanesia. Other evidence suggests that these first Americans were later massacred by invaders from Asia.

Until now, native Americans were believed to have descended from Asian ancestors who arrived over a land bridge between Siberia and Alaska and then migrated across the whole of north and south America. The land bridge was formed 11,000 years ago during the ice age, when sea level dropped.

However, the new evidence shows that these people did not arrive in an empty wilderness. Stone tools and charcoal from the site in Brazil show evidence of human habitation as long ago as 50,000 years.

The site is at Serra Da Capivara in remote northeast Brazil. This area is now inhabited by the descendants of European settlers and African slaves who arrived just 500 years ago.

But cave paintings found here provided the first clue to the existence of a much older people.

Images of giant armadillos, which died out before the last ice age, show the artists who drew them lived before even the natives who greeted the Europeans.

These Asian people have facial features described as mongoloid. However, skulls dug from a depth equivalent to 9,000 to 12,000 years ago are very different.

Walter Neves, an archaeologist from the University of Sao Paolo, has taken extensive skull measurements from dozens of skulls, including the oldest, a young woman who has been named Lucia.

"The measurements show that Lucia was anything but mongoloid," he says.

The skull dimensions and facial features match most closely the native people of Australia and Melanesia. These people date back to about 60,000 years, and were themselves descended from the first humans, who left Africa about 100,000 years ago. 

But how could the early Australians have travelled more than 13,500 kilometres (8,450 miles) at that time? The answer comes from more cave paintings, this time from the Kimberley, a region at the northern tip of Western Australia. 

Here, Grahame Walsh, an expert on Australian rock art, found the oldest painting of a boat anywhere in the world. The style of the art means it is at least 17,000 years old, but it could be up to 50,000 years old. 

And the crucial detail is the high prow of the boat. This would have been unnecessary for boats used in calm, inland waters. The design suggests it was used on the open ocean.