Water is amazing

Water- Drop one drop in a glass, get many bouncing up. 

Bottom section about to bead into a sphere.

Notice school age people visit, hence a little something for students.
The surface of the water can be modelled by Bessel fn, this is an app on an iphone 6 called Quick Graph, turns a mobile into a high powered graphics calculator.  Basically a sin(x) /x

Beading.

Water costs