"Reformpadagogik"""", German for progressive education, written with chalk on a blackboard, Germany, Europe"

"E=mc??"""", formula of the theory of relativity, written with chalk on a blackboard, Germany, Europe"

"LRS"""", the abbreviation of Lese-Rechtschreib-Schwaeche, German for dyslexia, written with chalk on a blackboard, Germany, Europe"

"School signs drawn on a blackboard with the signpost directing to the varying types of German secondary schools, """"Realschule"""", """"Mittelschule"""", """"Gymnasium"""", German for junior high school, middle school and high school, Germany, Europe"

Schonwetterwolken, Cumulus humilis, with sun, Bavaria, Germany, Europe

"Little cloud against blue sky, lit by the setting sun, Middle Franconia, Bavaria, Germany, Europe"

"Sun above the clouds, North Rhine-Westphalia, Germany, Europe"

"Little cloud against blue sky, lit by the setting sun, Middle Franconia, Bavaria, Germany, Europe"

"Chalk cliffs, Ruegen Island, Mecklenburg-Western Pomerania, Germany, Europe"

"Bank of clouds, fleecy clouds covering the sun, Germany, Europe"

Dramatic cloudy sky with sun rays, Baden-Wurttemberg, Germany, Europe

"Sun above the clouds, cumulus altus, stratocumulus, Mecklenburg-Vorpommern, Germany, Europe"

"Rain clouds with sun rays, Eckental, Middle Franconia, Bavaria, Germany, Europe"

"Chalk cliffs at sunrise, Sassnitz, Rugen, Mecklenburg-Western Pomerania, Germany, Europe"

"Sun rays through a cloudy sky, Upper Swabia, Baden-Wurttemberg, Germany, Europe"

Chalk cliffs in winter, Jasmund peninsula, Rugen, Mecklenburg-Western Pomerania, Germany, Europe

"Cloud with a sun drawn with chalk on a blackboard, Germany, Europe"