hmm, this is super interesting, though it's a shame that the data isn't really sourced - it links a medium.com article as a source, here. that one has a very different graph and very different lengths (notably it says that the equator countries had the shortest hair, not italy). the graph is here, but it sadly doesn't tell you what the numbers mean, if it's inches or something else. and there's no source as well. just says "collected by various NGOs" without even linking the data.
based on the way it's formatted, it looks like a copy-pasted article from some pdf, but i can't find any exact match for it in any public directory, might be worth messaging the authors. hair length of 7 inches or more is very rare for men here so it seems really fishy, unless they had a few knee-length metalheads skewing the results
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