Second-to-fourth digit ratio has a non-monotonic impact on altruism.

PLoS One · 2013 · PMC3622687 · PMID 23593214

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highly significantno p-value reported

The correlations between the left and right 2D:4D are 0.657 in 2010 ( ) and 0.661 ( ); highly significant ( ) but far from one.

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