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Two friends having a conversation by a lake

A friendship study found only about half of perceived bonds are mutual, showing why silence after you stop initiating can feel like an answer about who is reaching back

A study in PLOS ONE found that people often assume their friendships are mutual at far higher rates than the data show. The friendship study, associated with researchers from MIT Media Lab and Tel Aviv University, examined self-reported social ties and found a striking gap between expected closeness and actual reciprocity. Friendship feels deeply personal,…

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Abandoned rock quarry landscape with large stone blocks

Early Humans Were Quarrying Stone in South Africa 220,000 Years Ago

A study in Nature Communications reports that human groups in South Africa were making repeated trips to obtain toolmaking stone as early as about 220,000 years ago. Led by researchers associated with the University of Tübingen, the work centers on Jojosi, an open-air site where ancient people appear to have visited again and again for…