Physics
Understanding the Stability of Superhydrophobic Surfaces
Quick fact
A superhydrophobic surface can remain dry even after being submerged in water, thanks to a thin layer of air trapped between the water and the surface. This layer, called plastron, can persist for days under some conditions.
Why this is interesting
A water droplet sits on a leaf like a tiny crystal ball, rolling off with the slightest breeze. But why does that same droplet sometimes stick, and can we make surfaces that stay water-repelling forever?