"Dyskalkulie"""", German for dyscalculia, written with chalk on a blackboard, Germany, Europe"

"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"

"Chalk cliffs in the morning light, Jasmund National Park, Rugen, Mecklenburg-Western Pomerania, Germany, Europe"

Man repair bulb with glue, Germany, Europe

"Chalk cliffs at sunrise, Jasmund National Park, Ruegen, Mecklenburg-Western Pomerania, Germany, Europe"

Girl at blackboard in German class, elementary school, Germany, Europe

Chalk cliffs in early morning light, dark clouds, boulder, Jasmund National Park, Rügen, Mecklenburg-Western Pomerania, Germany, Europe

Chalk drawing, air escapes from flat tire, Berlin, Germany, Europe

"Beech forest on the edge of the steep coast in the first morning light, Dranske, Mecklenburg-Western Pomerania, Germany, Europe"

Girl at blackboard in German class, elementary school, Germany, Europe

Girl at blackboard in German class, elementary school, Germany, Europe

Girl at blackboard in German class, elementary school, Germany, Europe

Chalk cliffs in the morning light, boulders on the beach, Jasmund National Park, Rügen, Mecklenburg-Western Pomerania, Germany, Europe

Chalk cliffs of the cliffs in the morning light, Baltic Sea, Jasmund National Park, Rügen Island, Mecklenburg-Western Pomerania, Germany, Europe

various types of icons

bulbs, change, upheaval, evolution, 2002, one, numbers

Front view of a student writing on board

Boy and a girl in school uniform with a blackboard

"Light bulb drawn with chalk on a blackboard, Germany, Europe"