Human history has become too much a matter of dogma taught by 'professionals' in ivory towers as though it's all fact. Actually, much of human histor… - Graham Hancock

Archaeology is a deeply conservative discipline and I have found that archaeologists, no matter where they are working, have a horror of questioning anything their predecessors and peers have already announced to be true. They run a very real risk of jeopardizing their careers if they do. In consequence they focus — perhaps to a large extent subconsciously — on evidence and arguments that don't upset the applecart. There might be room for some tinkering around the edges, some refinement of orthodox ideas, but God forbid that anything should be discovered that might seriously undermine the established paradigm.

The black mat formed on top of the layer of proxies,' Allen replies. 'Down here it has a lot of charcoal in it. But it also has algal remains so it's not just fire. The Younger Dryas changed the climate and made the area much wetter. Algae began to grow along the edges of the lakes.' He puts a hand on the black stripe along the arroyo wall: 'So the remains of about 1,000 years of dead algae, charcoal, and a lot of other stuff are all embedded in here, and at the bottom of it, where the impact happened, we find iridium, platinum, and a layer of melted spherules where the temperatures must have been so high that they would have melted a modern car into a pool of metal.

More than seventy different indigenous Amazonian cultures use ayahuasca — many giving different names to the brew (yajé, natema, caapi, cipo, shori, etc.).