“Journey to the Microcosmos: Synura--Smelly, Flowery Confetti” explores Synura, a freshwater golden alga that forms spherical colonies and often blooms in spring and autumn. The video explains how these chrysophytes use flagella for movement, contain chlorophyll and xanthophyll pigments for photosynthesis, and develop intricate silica scales visible through electron microscopy. It also examines why Synura blooms can turn water brown and create cucumber-like, fishy, or floral odors through metabolic compounds such as aldehydes and ketones. With strong connections to biology, microbiology, ecology, and microscopy, the episode supports curriculum topics including cell structures, algae, photosynthesis, seasonal environmental change, and the ecological effects of algal blooms in freshwater ecosystems. Part of the "Journey to the Microcosmos" series.