Nature, Human

The goal of this feasibility cluster randomized trial is to determine whether a future large pragmatic cluster randomized controlled trial can be conducted to evaluate the effects of a nature-based intervention on children's mental and physical health. The intervention will be delivered in preschools located in or near public housing areas and compared with usual activities in similar preschools. The main questions it aims to answer are: * Are parents willing to participate in follow-up assessment using the Strengths and Dif-ficulties Questionnaire (SDQ)? * Can participants be successfully recruited, and can the nature-based intervention be delivered as intended? * Is it possible to gather data on children's motor development, physical activity, sleep, absenteeism, and stress, and on stress and absenteeism among educators and parents? * Is the intervention safe and acceptable for children, parents, and educators? Researchers will compare a 14-week nature-based intervention with usual preschool activities. The nature-based intervention is based on the Danish Outdoor Council's Green Sprouts ("Grønne Spirer") programme and focuses on using nature for play and learning. The intervention is being developed together with educators and children and includes nature-based activities designed to support motor development, physical activity, and positive interactions between children. Participants will: * Take part in either the nature-based intervention or usual preschool activities. * Complete questionnaires about child well-being, quality of life, and parental stress. * Participate in assessments of fine and gross motor skills. * Wear an activity monitor to measure physical activity and sleep. * Provide hair samples for measurement of stress-related hormones. * Take part in interviews and observations. The study will include approximately 56 children aged 4 to 6 years, their parents, and approx-imately 15 educators. The results will help determine whether the intervention can be implemented in preschools as currently designed and will inform the planning of a future large cluster-randomized controlled trial. No major risks are expected. Participants may experience minor discomfort when a small hair sample is collected for stress measurement.

The purpose of this study is determine the effect of nature and game based activities on happiness, spiritual well-being, frailty and cognitive status of older people in nursing home. Hypotheses of the Research H0: Nature and game-based activities don't affect the happiness, spiritual well-being, cognitive function and frailty of older people in nursing home. H1a: Happiness levels of older people in nursing home will be an increase after nature and game-based activities. H1b: Spiritual well-being levels of older people in nursing home will be an increase after nature and game-based activities. H1c: Cognitive function levels of older people in nursing home will be an increase after nature and game-based activities. H1d: Frailty status of older people in nursing home will be a decrease after nature and game-based activities.

Biodiversity is essential for nature and human well-being. Land use has reduced biodiversity in cities that is associated with altered commensal microbiota and a rising burden of immunological disorders among urban children. The investigators will estimate how rewilding of kindergarten yards affects commensal microbiome, prevalence of allergies, asthma, atopic dermatitis and infections, cortisol levels, cognitive skills and plasma cytokine levels of children. Our specific aims are: To assess if rewilding diversifies health-associated skin, saliva and gut microbiota and reduces infectious diseases and atopic or allergic symptoms. Assess whether the rewilding has positive effects on cognitive skills. Assess whether the rewilding changes cortisol and plasma cytokine levels. The investigators will recruit altogether 320 (160 per treatment) study subjects aged between 1-5 to questionnaire study (Task 2), from which 120 study subjects will be analyzed more detailed using microbiological and blood samples (Task 1).

The prevalence of atopic dermatitis has increased along with urbanization and biodiversity loss. According to biodiversity hypothesis, the main reason is urban lifestyle and reduced contact to microbial diversity. Previous studies indicate association between atopic dermatitis and exposure to natural microbes in childhood. Sand Play - the Effect of Biodiversity Exposure on Atopic Dermatitis will investigate whether the exposure to microbial diversity in sandbox reduces the symptoms of atopic dermatitis, alters commensal microbiota and modifies immune regulation in children.