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SciShow
High-Tech Masks: The Future of Face Coverings
Masks do wonders to stop the spread of infection and inhalation of harmful particles, and some new technology can make them both more effective and easier to clean.
Khan Academy
Khan Academy: Bouncing Droplets: Superhydrophobic and Superhydrophilic Surfaces
This video introduces the concept of surface tension, and shows how roughness can make a surface superhydrophobic or superhydrophilic. The Wenzel and Cassie-Baxter models are explained. [8:17]