For how we live.
Analysing 4,504 German twins, researchers found the pollution–wellbeing link ran mostly between families, not within twin pairs — pointing to shared circumstances as much as the air itself.
A UK survey of 26,322 urban adults finds a small but consistent life-satisfaction gain from neighbourhood greenery. A Stockholm study of 46,282 shows who ends up living without it.
Two large cohorts link purpose in life to lower mortality and lower Alzheimer's risk. Whether purpose protects health, or health sustains purpose, is what the studies cannot fully separate.
A 220,000-person cohort found opposite associations for two neurodegenerative diseases depending on the type and distance of greenery. Two other February papers ask who can actually use it.
Three UK studies of 1,907 sauna users point to social identity and ritual. Meanwhile a physiology paper shows a standard vascular measurement is confounded by heating itself.
Mindfulness, yoga, exercise and positive psychology landed within a narrow band of each other. Only combining exercise with a psychological approach pulled clear, and nature-based programmes did not beat controls.