Opening the evidence
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A 1961 estimate did put ancient copper extraction from the Lake Superior region at around 750,000 tons, which works out to about 1.5 billion pounds. But later researchers concluded that estimate relied on exaggerated and inaccurate assumptions, so the real figure is likely much lower.
Modern humans and Denisovans really did interbreed more than once, but the confirmed dates are much more recent than this claim suggests. Genetic studies put the known pulses of Denisovan admixture at roughly 30,000 to 54,000 years ago, not 200,000 to 250,000 years ago.
A minimum population estimate around 160 people for a multigenerational space voyage is real, but it comes from anthropologist John Moore's independent research, not a NASA study. Other researchers who ran the same kind of math, like Cameron Smith, landed on estimates in the tens of thousands, so there's no single NASA backed figure of 160 to 500.
A 250,000 year age for the Hueyatlaco site is a real published figure, from a 1981 analysis by geologist Virginia Steen-McIntyre and colleagues based on uranium and fission track dating of the sediment. But mainstream archaeologists largely reject that date as implausible, since stone tools that advanced aren't otherwise seen anywhere in the Americas until tens of thousands of years later, and the specific detail of an in situ camel pelvis isn't something we could confirm.
The Toba eruption 70,000 years ago really happened, and the idea that it crashed the human population to a few thousand people used to be the mainstream theory. More recent archaeological and genetic evidence, including stone tool continuity right across the ash layer and revised climate modeling, has pushed many researchers to doubt the population drop was ever that severe, and some now consider the bottleneck disproven.
Researchers really have pushed back estimates for when modern human behavior and symbolic thought emerged, from the old 50,000 year 'human revolution' idea to evidence stretching back roughly 100,000 to 300,000 years in Africa. That's a genuine and major shift in the field, but mainstream research doesn't support stretching the timeline back over a million years.
The FBI did seize more than 7,000 artifacts from Don Miller's Indiana collection in 2014, so that number is accurate, but it describes what was seized, not what was returned. As of 2019 only around 15 percent of the recovered items had actually been repatriated to their countries of origin.
There really are charred stones and hearth-like features at Pedra Furada that lead excavator Niede Guidon and her team have dated to 50,000 years or more, in some analyses up to about 60,000 years. What this leaves out is that many archaeologists think these are natural rockfalls or fire scars rather than human-made hearths, so whether people were actually there that long ago is genuinely disputed.
It's true that some researchers, led by Niede Guidon, argue that hearth features and stone tools at Pedra Furada show people were there more than 50,000 years ago. But that's one side of a real scientific dispute, since many archaeologists argue the same evidence can be explained by natural rockfalls rather than human activity, so it isn't settled proof of that early habitation.
The oldest confirmed Homo sapiens fossils are only about 300,000 years old, not a million. There's real scientific debate about when modern human behavior emerged, but no mainstream evidence puts anatomically modern humans on the planet for a million years.
Gobekli Tepe is genuinely much bigger than Stonehenge. Its tell covers about 8 hectares versus Stonehenge's earthwork enclosure of roughly 1 hectare, which by standard site area figures works out to something like 8 to 10 times larger, not 50 times.
Data exists for far more than about 1,200 languages. Glottolog 5.1 data, summarized by Language Miscellany, lists about 4,900 languages with at least a grammar sketch (1,904 long grammars, 1,027 shorter grammars, and 1,957 grammar sketches), and Hammarström's 2016 survey found that about 43 percent of languages lack any grammatical description. The 1,200 figure does not match these counts. Falsifier: a Glottolog or Ethnologue table showing only about 1,200 languages with a grammar or substantial description would flip this verdict.
The researcher who first connected the Pirahã to the Mura people and wrote some of the earliest accounts of them was Curt Nimuendajú, a German born ethnologist who visited Pirahã villages in 1921. He's one of the most important figures in early Brazilian ethnology, but calling him "the founder of Brazilian anthropology" overstates his role, and the record from that visit is general ethnographic notes, not a documented comprehensive word list.
Brazil's Instituto Socioambiental, which tracks the country's Indigenous peoples, says the Pirahã specifically "appear in chronicles and documents only from the end of the 19th century and the start of the 20th." Earlier 18th century accounts exist for the broader Mura people the Pirahã descended from, but not for the Pirahã as a separately named group.
Everett said in the episode that nobody had been killed by a jaguar in his almost 50 years of coming and going, though many were attacked. This is a first-hand observation about a small, remote group, and no database, paper or news report tracks Pirahã deaths by jaguars. I found nothing that confirms or contradicts it. A documented Pirahã death from a jaguar, in Everett's books, other researchers' field reports or Brazilian health records, would flip this to false.
The real event here is a February 2009 interview Chomsky gave to Folha de S.Paulo, Brazil's biggest newspaper, not a Spanish language station. In it he called Everett "a pure charlatan" and said serious linguists who work on Brazilian languages ignore him, which is close in spirit to saying his contributions amount to nothing, but the language and format don't match what's described here.
Pirahã grammar does have a way to mark possession, using a pronoun placed next to the possessed noun, so it's not accurate to say they lack the concept entirely. What Everett actually argues is narrower: Pirahã doesn't allow recursive or stacked possession, so you can't say something like "my friend's brother's house" in a single sentence.
Language records give a rough match. In Glottolog, about 1,900 of roughly 7,900 languages have only a word list or less, and about 1,050 more have no grammar, only a dictionary, texts or a phonology. But a word list means someone did record some words, and the data say nothing about culture or about 'tribes', so 'never studied' and 'over 2,000' are stronger than the evidence. A count showing well over 2,000 languages with no scientific record of any kind would flip this call.
There's a real example behind this: linguists Andrew Nevins, David Pesetsky, and Cilene Rodrigues published a widely read rebuttal of Everett's work on Pirahã without ever contacting him or anyone who actually spoke the language, drawing their facts entirely from his own older publications. That's a real, documented case of theory driven linguistics proceeding without fieldwork, but it's a stretch to generalize one controversy into a claim that prevailing linguistic theories as a whole discourage learning the languages being studied.
By his own account Everett had privately abandoned Christian belief by 1985 and kept that private into the late 1990s, well before 2001. The year 2001 does show up in his history, but as when he formally left the Summer Institute of Linguistics, the missionary organization he'd worked under, not as the year he stopped identifying as a Christian.
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