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    Digital illustration comparing size of Earth with planet Uranus. — Stock Photo
    Digital illustration comparing size of Earth with planet Uranus.
    School girl writing in her notebook — Stock Photo
    School girl writing in her notebook
    A Chinese Woman Looking Stressed Up Over Work. — Stock Photo
    A Chinese Woman Looking Stressed Up Over Work.
    High school students using computer in library — Stock Photo
    High school students using computer in library
    Junior high students with backpacks walking in school corridor — Stock Photo
    Junior high students with backpacks walking in school corridor
    Illustration of primordial solar nebula surrounding newborn star. — Stock Photo
    Illustration of primordial solar nebula surrounding newborn star.
    Female high school teacher leading lesson at projection screen in classroom — Stock Photo
    Female high school teacher leading lesson at projection screen in classroom
    Illustration of metal artificial heart on white background. — Stock Photo
    Illustration of metal artificial heart on white background.
    Low section of group of conservation volunteers cleaning up river in the countryside, bags of collected rubbish in front of them. Ecology and social responsibility in rural environment. — Stock Photo
    Low section of group of conservation volunteers cleaning up river in the countryside, bags of collected rubbish in front of them. Ecology and social responsibility in rural environment.
    Female silhouette with detailed liver on blue background, computer illustration. — Stock Photo
    Female silhouette with detailed liver on blue background, computer illustration.
    Male student on city street — Stock Photo
    Male student on city street
    Students in chemistery science class — Stock Photo
    Students in chemistery science class
    Schoolgirls sitting on steps with books and smiling — Stock Photo
    Schoolgirls sitting on steps with books and smiling
    Medical students practicing Heimlich manoeuvre on training dummy. — Stock Photo
    Medical students practicing Heimlich manoeuvre on training dummy.
    Portrait smiling male artist painting at easel in art class studio — Stock Photo
    Portrait smiling male artist painting at easel in art class studio
    Portrait enthusiastic junior high students and teachers cheering with arms raised — Stock Photo
    Portrait enthusiastic junior high students and teachers cheering with arms raised
    Young spanish boy doing homework while using a mask — Stock Photo
    Young spanish boy doing homework while using a mask
    Red colored mammary glands in female abstract body on blue background, digital illustration. — Stock Photo
    Red colored mammary glands in female abstract body on blue background, digital illustration.
    Active seniors stretching legs in circle — Stock Photo
    Active seniors stretching legs in circle
    Children drawing having fun at home — Stock Photo
    Children drawing having fun at home
    Teenage girl lying in bed and reading by window light. — Stock Photo
    Teenage girl lying in bed and reading by window light.
    Sitting on stool female silhouette with back pain, digital illustration. — Stock Photo
    Sitting on stool female silhouette with back pain, digital illustration.
    Top view of various plastic teeth models used for teaching dentistry students in human hand — Stock Photo
    Top view of various plastic teeth models used for teaching dentistry students in human hand
    University student using microscope — Stock Photo
    University student using microscope
    Chinese students with laptop and coffee in cafe — Stock Photo
    Chinese students with laptop and coffee in cafe
    School classroom full of pupils — Stock Photo
    School classroom full of pupils
    Lung cancer in female transparent body, conceptual computer illustration. — Stock Photo
    Lung cancer in female transparent body, conceptual computer illustration.
    Male silhouette with headache, digital illustration. — Stock Photo
    Male silhouette with headache, digital illustration.
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Overhead view high school students taking exam at desks in classroom — Stock Photo
    Overhead view high school students taking exam at desks in classroom
    Adorable boy in pajamas wearing book on head and enjoying reading while sitting on comfortable bed — Stock Photo
    Adorable boy in pajamas wearing book on head and enjoying reading while sitting on comfortable bed
    Female teacher and students conducting scientific experiment in laboratory classroom — Stock Photo
    Female teacher and students conducting scientific experiment in laboratory classroom
    Focused junior high boy student listening to friends in corridor — Stock Photo
    Focused junior high boy student listening to friends in corridor
    Male silhouette with visible upper body bones, computer illustration. — Stock Photo
    Male silhouette with visible upper body bones, computer illustration.
    Tired man using laptop computer lying on bed at home — Stock Photo
    Tired man using laptop computer lying on bed at home
    Illustration of hip joint in human skeleton. — Stock Photo
    Illustration of hip joint in human skeleton.
    3d illustration of flu pathogen in cross-section. — Stock Photo
    3d illustration of flu pathogen in cross-section.
    Portrait of smiling blonde girl talking by smartphone — Stock Photo
    Portrait of smiling blonde girl talking by smartphone
    Portrait of a girl sitting in classroom — Stock Photo
    Portrait of a girl sitting in classroom
    Box of dental equipment and dentures, high angle view — Stock Photo
    Box of dental equipment and dentures, high angle view
    African american student at chalkboard in class — Stock Photo
    African american student at chalkboard in class
    Cute schoolchild standing on brown background in studio and looking at camera — Stock Photo
    Cute schoolchild standing on brown background in studio and looking at camera
    Smiling teenagers sitting — Stock Photo
    Smiling teenagers sitting
    Male and female friends discussing — Stock Photo
    Male and female friends discussing
    Realistic structure of female musculature, computer illustration. — Stock Photo
    Realistic structure of female musculature, computer illustration.
    Young girl holding a small birds egg in her hands — Stock Photo
    Young girl holding a small birds egg in her hands
    Young Students standing in corridor — Stock Photo
    Young Students standing in corridor
    From above of crop anonymous student with pencil in hand working with dental model and papers during dentistry class — Stock Photo
    From above of crop anonymous student with pencil in hand working with dental model and papers during dentistry class
    Side view close up of a group of young African schoolchildren writing in their notebooks during a lesson in a township elementary school classroom — Stock Photo
    Side view close up of a group of young African schoolchildren writing in their notebooks during a lesson in a township elementary school classroom
    Smiling teenage girl with headphones using laptop on living room sofa — Stock Photo
    Smiling teenage girl with headphones using laptop on living room sofa
    Male teacher teaching girl — Stock Photo
    Male teacher teaching girl
    Male doctor practicing cardiopulmonary resuscitation on infant training dummy. — Stock Photo
    Male doctor practicing cardiopulmonary resuscitation on infant training dummy.
    Female college students studying at desk in classroom — Stock Photo
    Female college students studying at desk in classroom
    Realistic structure of female musculature, computer illustration. — Stock Photo
    Realistic structure of female musculature, computer illustration.
    Transparent male silhouette with colored liver, computer illustration. — Stock Photo
    Transparent male silhouette with colored liver, computer illustration.
    Female skeleton in transparent body silhouette on white background, computer illustration. — Stock Photo
    Female skeleton in transparent body silhouette on white background, computer illustration.
    Young woman reading book — Stock Photo
    Young woman reading book
    Students sitting on lecture with teacher in classroom — Stock Photo
    Students sitting on lecture with teacher in classroom
    Mature woman listening to music in headphones and reading paper while sitting in armchair and doing remote job on laptop near window at home — Stock Photo
    Mature woman listening to music in headphones and reading paper while sitting in armchair and doing remote job on laptop near window at home
    Group of multi ethnic kids sitting on their desk during the lesson with a female teacher wearing a face mask. Primary education social distancing health safety during Covid19 Coronavirus pandemic. — Stock Photo
    Group of multi ethnic kids sitting on their desk during the lesson with a female teacher wearing a face mask. Primary education social distancing health safety during Covid19 Coronavirus pandemic.