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In case you think that only American researchers are competing for the title of Professor Obvious, we've rustled up a study from the British Journal of Psychology, a beach read that's stacked neatly, to the best of our knowledge, on thousands of insomniacs' nightstands throughout the United Kingdom. What the authors of this paper, "Men behaving nicely: Public goods as peacock tails," claim to have discovered is summarized in the first sentence of the abstract:
Insights from sexual selection and costly signalling theory suggest that competition for females underlies men's public good contributions.
