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Smiling female math teacher holding books and pointing to a blackboard
An African male teacher in an empty classroom writing on whiteboard
Data analyst with business dashboard with charts,
Senior businessman in office with phone in hand.
A schoolgirl girl propped her face up with her palms, a teenager put her face in her palms.
Man teaching methods for coping with anxiety.
Go Vote Louisiana
Icelandic money - krona in UV rays
An Asian female student stood in front of a blackboard in the classroom.
Vintage photograph of Luke Fildes British painter and illustrator born in Liverpool and trained at the South Kensington and Royal Academy Schools.
A closeup of a Helvetia stamp isolated on a white background
Blackboard with a the map of the State of New Jersey (USA) drawn in the middle.
Young and beautiful student studying mathematical formula in front of the blackboard
Young female teacher holding books and posing in front of a blackboard with text online learning
Vernon, Connecticut, USA - February 23, 2008: U. S. postage stamp issued in 1981 depicts biologist and ecologist and author Rachel Carson. She wrote a controversial book about pesticides and was recognized posthumously by President Carter who awarded her the Presidential Medal of Freedom. She died in 1964.
Science teacher showing beakers with red and blue liquids to school students in class when explaining new topic
Vintage photograph Pavilion of the Ministry of War, Exposition Universelle 1889, Paris, 19th Century
Shocked woman. Lost opportunities. Online presentation. Scared lady in formal clothes closing mouth hand looking at camera flipchart boards on background.
Student holding digital tablet to background of a blackboard with mathematical formulas
chemistry teacher writing and explain chemical formula on class board, study
London, England - December 5, 2015: Advertisement showing the exterior of the showroom of Swan Nash, Furnishing Ironmonger, of 253 Oxford Street, London - part of an advertisement section in “Peter Parley’s Annual for 1865â€, William Kent & Co, 1864. The showroom contains luxury items such as baths, perdoniums, kettles, lamps, fireplaces, chests etc.
Collection of colorful buttons with handmade writing. The photo was taken at a high angle.
Young asian teacher woman sitting using laptop. Close up hand business texting on keyboard.
Vintage photograph of H. Rider Haggard in his study, 1890s
a young woman business coach in a white blouse and glasses shows with her hand a diagram of building a business on a graph. office work
Portrait of mature adult man in lab coat before blackboard
teacher of chemistry against blackboard explain chemical formula, education concept
Smiling businessman using laptop at office
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