According to the Oxford English Dictionary scum is:
A film or layer of floating matter formed upon the surface of a liquid in a state of fermentation, ebullition, etc.; hence, a film formed upon stagnant, foul water, etc. More generally, any undesirable surface layer or deposit, usually but not necessarily on a liquid.
or when applied to persons:
The offscourings of humanity; the lowest class of the population of a place or country.
This turbulent scum was floating on the River Ythan this morning. The mathematics that lie behind those complex patterns are quite beyond my O level maths!
#afternoon #saturday #february #mathematics #chaos #ythan #scum #turbulence
Roman Czarny Amazing comment (as ever) and the fabulous colors of scum ;-)