Top left: first Winogradsky column. lower right: New Winogradsky Column in protected area. Other images: Handiworks of Mr. Racoon including incriminating footprints.
It is known as a Winogradsky Column and is supposed to be an environment for microbes, full of mud, water, paper shreds, and an egg yolk. Mix it together, then put it in a sunny place and watch for changes due to microbe growth. What could go wrong?
Enter the racoon that smelled the egg yolk and ravaged the contents of the bottle. Oh well, it ate mostly mud with the slightest taste of egg. So, was the “yolk” on him or on me? At any rate, a new Winogradsky Column is now in an area that Mr. Racoon can’t reach.