A large-scale experiment tested the impact of changing the Bluesky feed-ranking algorithm on political content and perceptions during the 2024 US presidential election. By making feeds more representative of users, the ‘diversified extremity’ algorithm reduced exposure to polarizing content and made perceptions of social norms more accurate, without reducing user enjoyment.

One in six Internet-using adolescents in parts of Africa and Asia faced technology-facilitated sexual abuse in 2020–21. As digital access expands globally, better protection is crucial.

The global likelihood of damage from hailstorms is predicted to increase substantially by the end of the century, owing to increases in hailstone size as the climate warms. However, regional differences are expected, with greater increases in hailstone size and damage in mid-latitudes and reductions in the tropics and subtropics.

Massive analyses of RNA transcripts from rodents, monkeys and humans reveal hallmarks of ageing that could expedite the development of anti-ageing interventions.