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Seren Village has abundant organic waste potential, particularly banana peel waste generated from banana-processing MSME activities and wood ash resulting from household firewood combustion. To date, this waste has not been optimally utilized and is often discarded, thereby posing potential environmental problems. This study aims to process banana peel waste and wood ash into an innovative, environmentally friendly shoe polish made from natural materials, while also enhancing the economic value and welfare of the community. The research employed a descriptive qualitative method with a case study approach. Data were collected through observation, interviews, and documentation involving the women’s Family Welfare Empowerment Group (PKK) of Seren Village as the target participants. The shoe polish production process includes drying and grinding banana peels, mixing them with a wood ash solution that functions as a natural coloring agent, adding supporting materials, and heating the mixture until a ready-to-use shoe polish is obtained. The results indicate that the shoe polish produced from banana peels and wood ash has a solid texture, is slightly coarse, non-glossy, and has a relatively fast drying time of approximately one minute. In addition, the product shows good resistance to water splashes and does not damage the surface of shoes. The use of natural ingredients makes this shoe polish safer for health. The utilization of this waste has the potential to support MSME development, reduce environmental pollution, and sustainably improve the welfare of the Seren Village community.

The microbiological quality of clean water in Dusun Kepuhan has not met regulatory standards, posing potential health risks to the community. Laboratory examination identified Escherichia coli at 21 CFU/100 mL and total coliform bacteria at 180 CFU/100 mL, exceeding the permissible limits established by the Indonesian Ministry of Health Regulation No. 2 of 2023. This community service program was conducted to enhance residents’ knowledge and practical skills in managing clean water through the application of a chlorine diffuser as a simple and practical disinfection method. The implementation process included problem identification, coordination with the local PAMSIMAS management, educational sessions, and hands-on demonstrations of diffuser preparation and use. Program effectiveness was evaluated using pre-test and post-test assessments involving 30 participants. The findings indicated a statistically significant improvement in participants knowledge following the training. The chlorine diffuser approach was considered appropriate for the community setting due to its ease of use, affordability, and gradual chlorine release mechanism. Continuous monitoring and sustained community commitment are necessary to ensure long-term implementation of safe water disinfection practices.

Physics learning requires students’ multirepresentational ability to understand concepts through verbal, mathematical, pictorial, or graphical forms. However, instruction at SMAN 1 Natal is still dominated by conventional methods, resulting in less active student participation and low multirepresentational skills. This study aims to determine the improvement of students’ multirepresentational ability after the implementation of the Problem Posing learning model on the topic of sound waves. The research employed a quantitative approach with a quasi-experimental design. The sample consisted of class XI MIPA 1 as the control class and class XI MIPA 2 as the experimental class. The research instrument was a multirepresentation test administered through pre-test and post-test. Data were analyzed using the Shapiro–Wilk test, the Mann–Whitney test, and the N-Gain test. The results of the normality test indicated that the data were not normally distributed; therefore, hypothesis testing was continued using the Mann–Whitney test, which yielded a significance value of 0.00 < 0.05. This result indicates a difference in the improvement of multirepresentational ability between the experimental and control classes. The N-Gain result for the experimental class was 49.40%, categorized as moderate. Thus, the implementation of the Problem Posing learning model in the experimental class resulted in an improvement that was lower than that of the control class

This study aims to develop a teaching module focused on mathematical problem posing and problem solving, specifically within the topic of statistics. The goal is to create a module that is not only valid, practical, and effective but also capable of honing the critical and creative thinking skills of high school students. This study utilizes the Research and Development (R&D) method following the 4D development model. The subjects of this research were 10th-grade high school students. The research findings indicate that the teaching module is considered highly valid, with a score of 4.13. In terms of practicality, it achieved a score of 3.8, suggesting the module is user-friendly, engaging, and supportive of a smooth learning process. The module proved effective in improving students' critical and creative thinking skills, as evidenced by a 42% increase in average test scores after using the module. This research suggests that the developed teaching module is feasible for use as instructional material at the high school level and is capable of strengthening students' critical and creative thinking abilities. This module serves as an alternative instructional resource that encourages active, innovative mathematics learning oriented toward the development of high-order thinking skills (HOTS).