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Yes, it's based on a real Finnish study (Natural Resources Institute Finland, 2022–2024). Researchers "rewilded" urban daycare yards by adding forest floor soil, moss, plants, and natural materials instead of just asphalt, gravel, or rubber mats.
Within 28 days, kids showed more T-regulatory cells in blood tests (helping immune balance). After a year: more diverse skin/gut microbiomes and fewer potentially harmful bacteria like Streptococcus.
Not a nationwide rubber-to-mud swap, but the health benefits from everyday dirt exposure are well-supported. Ancestors weren't wrong about letting kids get dirty.
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