10/06/2026
Our middle school scientists took on the ultimate cellular challenge: testing selective permeability! Using simple tools—an iodine solution, cornstarch, and a plastic sandwich bag—students modeled how a cell membrane decides what gets in and what stays out. Watching the clear cornstarch inside the sealed bag turn dark purple as the iodine diffused through was a true "aha!" moment!
Check out these future biologists hard at work observing diffusion and cell transport in real time.