Measuring masculinity

Men are increasingly worried about their testosterone levels. Treatment can help some, but might it harm others?

By James Ball

A photo portrait of the author Erin Somers
culture

Late awakening

We meet the novelists behind a new wave of stories exploring the sexual fantasies of midlife women

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science & technology

Prophet bots

Artificial intelligence agents seem to have created their own religion, Crustafarianism. Is that possible?

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