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    Back view of unrecognizable male hiker in casual clothes walking at riverside under rainbow towards spectacular Skogafoss waterfall flowing through massive rocky cliff covered with green moss — Stock Photo
    Back view of unrecognizable male hiker in casual clothes walking at riverside under rainbow towards spectacular Skogafoss waterfall flowing through massive rocky cliff covered with green moss
    Close-up of rack of cell cultures in tubes in laboratory. — Stock Photo
    Close-up of rack of cell cultures in tubes in laboratory.
    Close-up of multiple test stick being placed into urine sample tube by female doctor. — Stock Photo
    Close-up of multiple test stick being placed into urine sample tube by female doctor.
    Unrecognizable person standing in snow surrounded by forest and mountains — Stock Photo
    Unrecognizable person standing in snow surrounded by forest and mountains
    Ethnic girl showing green plant to brother while looking away on binocular and sitting on terrain with paper map and loupe in woods — Stock Photo
    Ethnic girl showing green plant to brother while looking away on binocular and sitting on terrain with paper map and loupe in woods
    Woman explorer drinking water from a canteen on a mountain top — Stock Photo
    Woman explorer drinking water from a canteen on a mountain top
    Three children sailing on a lake on a wooden raft, Lake Superior, United States — Stock Photo
    Three children sailing on a lake on a wooden raft, Lake Superior, United States
    Astronaut in space, computer illustration — Stock Photo
    Astronaut in space, computer illustration
    Close-up of hands of scientist holding test tube. — Stock Photo
    Close-up of hands of scientist holding test tube.
    Women with suitcase in front of the car with smoke — Stock Photo
    Women with suitcase in front of the car with smoke
    Three generations of men admiring leaves — Stock Photo
    Three generations of men admiring leaves
    Audience watching male speaker on stage — Stock Photo
    Audience watching male speaker on stage
    Computer programmers testing virtual reality simulator glasses in office — Stock Photo
    Computer programmers testing virtual reality simulator glasses in office
    Boy students examining liquid in test tube, conducting scientific experiment in laboratory classroom — Stock Photo
    Boy students examining liquid in test tube, conducting scientific experiment in laboratory classroom
    Male traveler with trekking sticks standing near lake in woods — Stock Photo
    Male traveler with trekking sticks standing near lake in woods
    Happy optimistic young female hiker in activewear with backpack enjoying journey in green forest in sunny day — Stock Photo
    Happy optimistic young female hiker in activewear with backpack enjoying journey in green forest in sunny day
    Beautiful sunset over river delta — Stock Photo
    Beautiful sunset over river delta
    Close up view of golden compass in female hand — Stock Photo
    Close up view of golden compass in female hand
    International Space Station — Stock Photo
    International Space Station
    Male teacher helping girl student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher helping girl student using microscope, conducting scientific experiment in laboratory classroom
    Digital forensic science technician examining computer hard drive with magnifying glass in laboratory. — Stock Photo
    Digital forensic science technician examining computer hard drive with magnifying glass in laboratory.
    Back view of unrecognizable climber walking on slope of snow covered rocky mountain range in sunny weather — Stock Photo
    Back view of unrecognizable climber walking on slope of snow covered rocky mountain range in sunny weather
    Seven year old boy looking at a praying mantis — Stock Photo
    Seven year old boy looking at a praying mantis
    Close-up of male scientist experimenting in laboratory — Stock Photo
    Close-up of male scientist experimenting in laboratory
    Teenage girl experimenting on microscope in laboratory at university — Stock Photo
    Teenage girl experimenting on microscope in laboratory at university
    From below male hiker standing on boulder and next to waterfall and looking away in forest — Stock Photo
    From below male hiker standing on boulder and next to waterfall and looking away in forest
    Boy kayaking in lake filled with water lilies — Stock Photo
    Boy kayaking in lake filled with water lilies
    Hot air balloon flying over the Masai Mara, Kenya — Stock Photo
    Hot air balloon flying over the Masai Mara, Kenya
    Boy walking through the woods in autumn, United States — Stock Photo
    Boy walking through the woods in autumn, United States
    Tourist from his back looks at beautiful and calm turquoise lake — Stock Photo
    Tourist from his back looks at beautiful and calm turquoise lake
    Sibling at poolside looking at small crab — Stock Photo
    Sibling at poolside looking at small crab
    Amazed ethnic child in checkered shirt with open mouth studying green plant leaf with magnifying glass in woods — Stock Photo
    Amazed ethnic child in checkered shirt with open mouth studying green plant leaf with magnifying glass in woods
    Distant view of boy kayaking in lake — Stock Photo
    Distant view of boy kayaking in lake
    Students and teacher walking in forest — Stock Photo
    Students and teacher walking in forest
    Male hiker walking on trail in woods during trekking in summer — Stock Photo
    Male hiker walking on trail in woods during trekking in summer
    Children hugging by teepee at campsite — Stock Photo
    Children hugging by teepee at campsite
    Teacher and students enjoying elephants toothpaste foam interactive exhibit in science center — Stock Photo
    Teacher and students enjoying elephants toothpaste foam interactive exhibit in science center
    Three people walking along footpath in the forest, Ukraine — Stock Photo
    Three people walking along footpath in the forest, Ukraine
    Woman hiking in an autumn forest, Bad Gastein, Salzburg, Austria — Stock Photo
    Woman hiking in an autumn forest, Bad Gastein, Salzburg, Austria
    1qAfrosty tent on a field in South Wales — Stock Photo
    1qAfrosty tent on a field in South Wales
    Scientist making experiment with steaming flasks — Stock Photo
    Scientist making experiment with steaming flasks
    Woman getting ready for ski touring at ski cottage in Iceland — Stock Photo
    Woman getting ready for ski touring at ski cottage in Iceland
    Woman walking on beach, Besser Rev, Samsoe, Denmark — Stock Photo
    Woman walking on beach, Besser Rev, Samsoe, Denmark
    Confident female astronaut standing in nature in evening — Stock Photo
    Confident female astronaut standing in nature in evening
    Smiling safari tour guide leading group in sunny grassland — Stock Photo
    Smiling safari tour guide leading group in sunny grassland
    Close up of woman rappelling of cliff in south Wales — Stock Photo
    Close up of woman rappelling of cliff in south Wales
    Side view of a couple of hippies sitting on the porch floor with bare feet looking away — Stock Photo
    Side view of a couple of hippies sitting on the porch floor with bare feet looking away
    Asian kid walking barefoot in street — Stock Photo
    Asian kid walking barefoot in street
    Man operating a flying drone in countryside — Stock Photo
    Man operating a flying drone in countryside
    Woman on street with aged building — Stock Photo
    Woman on street with aged building
    Boy crossing a fallen log in winter, United States — Stock Photo
    Boy crossing a fallen log in winter, United States
    Scuba diver exploring cave at the Great Barrier Reef — Stock Photo
    Scuba diver exploring cave at the Great Barrier Reef
    Man climbing icicle inside glacier cave in Iceland — Stock Photo
    Man climbing icicle inside glacier cave in Iceland
    Woman enjoying tranquil snowy mountain view from waterfront fishing village, Lofoten Islands, Norway — Stock Photo
    Woman enjoying tranquil snowy mountain view from waterfront fishing village, Lofoten Islands, Norway
    Male hiker in warm clothes standing in snowy winter woods and looking in binoculars — Stock Photo
    Male hiker in warm clothes standing in snowy winter woods and looking in binoculars
    Microscope and pile on Petri dishes in laboratory on blue background. — Stock Photo
    Microscope and pile on Petri dishes in laboratory on blue background.
    Kind smiling man and pretty woman laughing in front seat of car in desert place looking at camera — Stock Photo
    Kind smiling man and pretty woman laughing in front seat of car in desert place looking at camera
    Ethnic girl with brother studying plant foliage with magnifying glass while sitting against river and cascade — Stock Photo
    Ethnic girl with brother studying plant foliage with magnifying glass while sitting against river and cascade
    Father with son picking strawberries together — Stock Photo
    Father with son picking strawberries together
    A Caucasian woman and her daughter enjoying time together in a sunny garden, embracing, looking at each other and smiling — Stock Photo
    A Caucasian woman and her daughter enjoying time together in a sunny garden, embracing, looking at each other and smiling