Expert commentary for subscribers on exciting science published in Nature and elsewhere, from astronomy to zoology. Login info at go.nature.com/3zDzi5T

Motherhood induces transcriptional changes in the brain that endure beyond short-term hormonal shifts go.nature.com/4v1BbFP
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A large language model that is trained to respond in a warm manner is more likely to give incorrect information and reinforce conspiracy beliefs go.nature.com/4t7abn3
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Red blood cells have been modified to form strong clots that halt any bleeding almost instantly and then promote tissue regeneration go.nature.com/4d2XvYu
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406