The discovery of fire by humans: a long and convoluted process.

Philos Trans R Soc Lond B Biol Sci · 2016 · PMC4874402 · PMID 27216521

Europe PMC DOI

hedged sentence

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closest p

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boldest claim

The sentences

highly significantno p-value reported

Effective hafted systems require glue or twine—it may be highly significant that two of the main glues require heat treatment for their production [ 87 , 88 ].

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.