[DannyTN]

"The discovery adds to evidence that the hinterlands of the Amazon once teemed with complex societies, which were largely wiped out by diseases brought to South America by European colonists in the 15th and 16th centuries, Schaan said."

How on earth do they jump to the conclusion that it was disease brought by European colonists? There is no indication they know who built them, why, or even when? Much less why those structures were abandoned.

[YHAOS]

"How on earth do they jump to the conclusion that it was disease brought by European colonists?"

Instinct? . . . And, conditioned response?