Surface roughness of PLA carbon fiber printed using fused deposition modeling is examined, while another paper delves into the leaf anatomical and micromorphological significance of Schoutenia Korth. in Peninsular Malaysia. Research on PLA/fish scales hydroxyapatite composites focuses on mechanical and thermal properties. The influence of different ratios of GDC-SDC on SSC/GDC–SDC dual composite cathode for intermediate-temperature solid oxide fuel cells is analyzed. A study fabricates silica water filters from rice husk waste via slip casting. Characterization of weathered REE-bearing granitoid from Hulu Langat is also presented. PM2.5 and microbial aerosol composition in university biology labs are examined. The mineralogy and geochemistry of the tin-tungsten deposit in Sintok, Kedah, are investigated. The effect of thermal input on the microstructure and wear properties of surface alloyed DSS with SiC by TIG melting techniques is explored. Lastly, the development of polyurethane–silica aerogel composite for cryogenic insulation applications is discussed.