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Sacramento, California, USA - March 19, 2011: 1956 Israel postage stamp with a portrait of Albert Einstein to the right of his E=mc2 equation.

Indian young teacher man looking at camera sitting teaching online video conference live stream. Asian teacher teaching class webinar online for students learning.

Portrait Of Teacher Writing On Blackboard In Classroom

Simon Rodriguez Portrait Pattern Design on Venezuelan Bolivar Currency

Close up portrait of George Washington from dollar bill against black background.

young cheerful professor in front of blackboard

Frustrated senior teacher standing in front of a chalk board.

His mind works differently to many

Portrait of male teacher at a university sitting in a comfortable leather chair at the department.

A teacher with a long white beard, big gray hair, and glasses is wearing a checkered shirt and sports jacket in front of a blackboard with complex formulas written on it. He looks sternly at the camera, holding his glasses with one hand.

Richmond, Virginia, USA - July 9th, 2013: Cancelled Stamp From Israel Featuring The Scientist, Albert Einstein.

Painting Benjamin Franklin face on us one hundred dollar bill ma in New York, New York, United States

The young businessman tries to solve problems

Simon Rodriguez Portrait Pattern Design on Venezuelan Bolivar Currency

Mihai Eminescu cit from 1000 Romanian lei banknote, 1996 Series - paper, for design purpose

Macro shot of the five turkish lira banknote.

Indoor image of an exhausted male teacher or professor feeling sleepy in the classroom. He is standing against blackboard where his thought bubble is drawn depicting his sleepiness condition. The bespectacled man is in formal shirt, sweater and coat. One person, waist up, horizontal composition with copy space.

Artistic collage. Solving business issues. A light bulb from the head The concept of modern art collage.

Simon Bolivar (1783 - 1830) Portrait from Venezuelan Banknotes. Venezuelan military and political leader

A teacher with a long white beard, big gray hair, and glasses is wearing a checkered shirt and sports jacket in front of a blackboard with complex formulas written on it. He looks sternly at the camera over his glasses with his index finger raised.

Komitas - Soghomon Soghomonian - a closeup portrait from Armenian money - Dram

Mature adult teacher wearing a yellow button down shirt,blue waist,pants and necktie standing in front of blackboard for teaching math.He is standing on the right side of frame.The green chalkboard is full of mathematics.He is wearing glasses and has curly hair and mustache.The photo was shot is studio with medium format DSLR camera Hasselblad horizontally.

Human head with mathematical seamless pattern on white background

Image from 19th century.

5G and AI technology, Global communication network concept. Business graph. Global business.

The portrait of Jan Amos Komensky from 20 Czechoslovakian Koruna banknote isolated on a white background

A teacher with a long white beard, big gray hair, and glasses is wearing a checkered shirt and sports jacket in front of a blackboard with complex formulas written on it. He looks sternly at the camera over his glasses with his index finger raised.

Reverend John Flynn a closeup portrait from Australian money - Dollar

Newton's Equations. Rear view, close-up on young man standing back against green chalkboard. He explains, solves physics tasks, retro style. Processing for retro bleached look, slight vignette added.

Free Images: "bestof:albert einstein portrait theoretician physician scientist personality of the 20th century e mc2 equation theory of relativity general relativity quantum"

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