New research provides a solution for the century-and-half-old puzzle of why capillary condensation, a fundamentally microscopic phenomenon involving a few molecular layers of water, can be described reasonably well using macroscopic equations and macroscopic characteristics of bulk water. Is it a coincidence or a hidden law of nature? (1)

Look at those children play. Building sandcastles in the sand.

They will be soon washed away.

But don't worry. That is why they are building them...

Hey dad!

See?!

(Can you laugh while dying?)