Early male friendship as a precursor to substance abuse in girls

In childhood, boys and girls tend to form friendships almost exclusively with same-sex peers. Around early adolescence, they gradually begin to include other-sex friends in their network. A new study published in Journal ...

Friendships are built on alliances, research shows

New research from the University of Pennsylvania is challenging some longtime assumptions about why human beings seek and keep their friends, and it reveals a somewhat darker side to the very nature of friendship itself.

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