Where is this from? This appeared just when I needed it.
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Purity

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Some study I read had the conclusion that this is gender biased. Girls build connection by sharing, boys do it w cooperative competition.
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We aren't that different to cows and other animals in identity. It has been shown in squirrels how they hide things they have an awareness of identity and knowledge to them when they hide their nuts.
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There's a whole family of theories about how human intelligence evolved for basically nothing more than gossip and secret-keeping.
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