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Few animal images spread across the internet quite as reliably as a pair of sea otters floating on their backs, paws clasped together as they doze in the waves. It looks like an unmistakable gesture of affection, and in a sense, it partly is, but the full explanation behind the behaviour turns out to be more practical than romantic.

As climate change drives temperatures higher, farmers are facing a growing challenge: protecting crops from extreme heat without reducing the sunlight they need to grow. Conventional shade nets can lower temperatures, but they also block visible light, limiting photosynthesis and potentially affecting yields.

Spain's longest river is sending an unsettling warning about the growing impact of pollution on freshwater ecosystems. A year-long scientific investigation has detected antibiotic-resistant bacteria and evidence of faecal contamination at multiple monitoring sites along the Tagus River, raising concerns about water quality, public health and the spread of antimicrobial resistance.