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    Three children having a snowball fight. — Stock Photo
    Three children having a snowball fight.
    Junior high girl students walking in corridor — Stock Photo
    Junior high girl students walking in corridor
    Junior high students and teacher using computers in computer lab — Stock Photo
    Junior high students and teacher using computers in computer lab
    Focused high school girl student taking exam — Stock Photo
    Focused high school girl student taking exam
    High school teacher calling on students during lesson in classroom — Stock Photo
    High school teacher calling on students during lesson in classroom
    College students experimenting on microscope in laboratory at university — Stock Photo
    College students experimenting on microscope in laboratory at university
    High school teacher calling on students with hands raised in classroom — Stock Photo
    High school teacher calling on students with hands raised in classroom
    High school girl student taking exam at desk in classroom — Stock Photo
    High school girl student taking exam at desk in classroom
    High school students watching female teacher leading lesson at projection screen in classroom — Stock Photo
    High school students watching female teacher leading lesson at projection screen in classroom
    Junior high students hanging out on stairs — Stock Photo
    Junior high students hanging out on stairs
    Teenage boy experimenting on microscope in laboratory at university — Stock Photo
    Teenage boy experimenting on microscope in laboratory at university
    Focused high school girl student taking exam at desk in classroom — Stock Photo
    Focused high school girl student taking exam at desk in classroom
    Two woman sitting at the table across each other — Stock Photo
    Two woman sitting at the table across each other
    Junior high students working at computers in computer lab — Stock Photo
    Junior high students working at computers in computer lab
    Junior high girl students walking and talking in corridor — Stock Photo
    Junior high girl students walking and talking in corridor
    Junior high students hanging out, talking on stairs — Stock Photo
    Junior high students hanging out, talking on stairs
    Teenage boy and girl — Stock Photo
    Teenage boy and girl
    College students studying in library at university — Stock Photo
    College students studying in library at university
    Portrait confident junior high students — Stock Photo
    Portrait confident junior high students
    Teenage girl student using mobile phone while studying in library — Stock Photo
    Teenage girl student using mobile phone while studying in library
    Junior high students at computers watching teacher at projection screen in classroom — Stock Photo
    Junior high students at computers watching teacher at projection screen in classroom
    Children riding on sledges on the snow. — Stock Photo
    Children riding on sledges on the snow.
    Junior high students hanging out on stairs — Stock Photo
    Junior high students hanging out on stairs
    High school teacher supervising students taking exam at desks — Stock Photo
    High school teacher supervising students taking exam at desks
    Thoughtful teenage girl sitting in classroom at university — Stock Photo
    Thoughtful teenage girl sitting in classroom at university
    Children riding on sledges on the snow. — Stock Photo
    Children riding on sledges on the snow.
    Teacher teaching students on whiteboard in classroom — Stock Photo
    Teacher teaching students on whiteboard in classroom
    Junior high girl students walking in corridor — Stock Photo
    Junior high girl students walking in corridor
    High school students with hands raised in debate class — Stock Photo
    High school students with hands raised in debate class
    High school girl student raising hand, asking question during lesson in classroom — Stock Photo
    High school girl student raising hand, asking question during lesson in classroom
    High school girl students talking, doing homework in classroom — Stock Photo
    High school girl students talking, doing homework in classroom
    Focused high school girl student taking exam at desk in computer — Stock Photo
    Focused high school girl student taking exam at desk in computer
    High school teacher supervising students taking exam at desks — Stock Photo
    High school teacher supervising students taking exam at desks
    College students studying in computer classroom at university — Stock Photo
    College students studying in computer classroom at university
    College students experimenting chemical in laboratory at university — Stock Photo
    College students experimenting chemical in laboratory at university
    Smiling high school girl student talking with classmates in classroom — Stock Photo
    Smiling high school girl student talking with classmates in classroom
    Confident high school boy student giving presentation in classroom — Stock Photo
    Confident high school boy student giving presentation in classroom
    High angle view of college students walking on staircase — Stock Photo
    High angle view of college students walking on staircase
    High school teacher supervising students taking exam at desks — Stock Photo
    High school teacher supervising students taking exam at desks
    Junior high students walking in corridor — Stock Photo
    Junior high students walking in corridor
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    High school students talking in debate class at table in classroom — Stock Photo
    High school students talking in debate class at table in classroom
    College students experimenting on microscope in laboratory at university — Stock Photo
    College students experimenting on microscope in laboratory at university
    High school students talking at table in debate class — Stock Photo
    High school students talking at table in debate class
    Children grouped laughing by a snow bank. — Stock Photo
    Children grouped laughing by a snow bank.
    High school students with hands raised, asking questions during lesson in classroom — Stock Photo
    High school students with hands raised, asking questions during lesson in classroom
    Close-up of two young friends smiling — Stock Photo
    Close-up of two young friends smiling
    College students studying in library at university — Stock Photo
    College students studying in library at university
    Group of happy people stretching outdoors after training — Stock Photo
    Group of happy people stretching outdoors after training
    Group of young people huddling outdoors — Stock Photo
    Group of young people huddling outdoors
    High school students studying at tables in classroom — Stock Photo
    High school students studying at tables in classroom
    Young girl doing push-ups with his personal trainer — Stock Photo
    Young girl doing push-ups with his personal trainer
    College students studying in library at university — Stock Photo
    College students studying in library at university
    Teacher assisting students in experiment at laboratory — Stock Photo
    Teacher assisting students in experiment at laboratory
    Young girl training in gym with her personal trainer — Stock Photo
    Young girl training in gym with her personal trainer
    Children running across snow carrying sledges. — Stock Photo
    Children running across snow carrying sledges.
    High school students taking exam at desks in classroom — Stock Photo
    High school students taking exam at desks in classroom
    Father and son listening to music with MP3 player, indoors — Stock Photo
    Father and son listening to music with MP3 player, indoors
    Junior high students descending stairs — Stock Photo
    Junior high students descending stairs
    Junior high students descending stairs — Stock Photo
    Junior high students descending stairs