"Boy with a book in a classroom, in the community of Mbya-Guarani Indians, Campito, Caaguazu Department, Paraguay, South America"

School children sitting at their desks, classroom, Shan State, Myanmar, Asia

School children sitting at their desks, classroom, Shan State, Myanmar, Asia

School children sitting at their desks, classroom, Shan State, Myanmar, Asia

Elementary school student

"Elementary school children with an immigrant background sitting in a primary school class, Reith im Alpbachtal, Kufstein District, Tyrol, Austria, Europe"

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

Elementary school student working in computer room, Lower Saxony, Germany, Europe

Elementary school student

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

Students in group lessons, primary school, Lower Saxony, Germany, Europe

"Girl, 6, sitting at a school desk and turning to look behind, in Reith im Alpbachtal, Kufstein District, Tyrol, Austria, Europe"

Illustration of a person writing at a desk

A drawing of a young boy looking expressive in thought

Portrait of a woman.

Montage of the US Flag, a school and students writing at desks

Montage of a microscope, a student writing at desk, a ruler, a triangle and a compass

An elderly woman with a headache

Close-up of a serious woman.

Portrait of a woman.

Side view of a boy making drawing on board

Front view of businessman looking up

A boy cheating on an exam

A boy sleeping at his desk

Schoolboy looking thoughtful in a classroom