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Schoolboy putting leaves on microscope slide in school laboratory.

Young female scientist doing experiment with liquid in laboratory.

Young male and female scientists working in laboratory.

Woman working with substances in laboratory

Scientific or medical samples on glass table

Hands in gloves of female scientist in laboratory shaking glass flask with dissolved samples of soil.

Young male scientist working in laboratory with glassware.

Mountaineer filling his water bottle

Male laboratory assistant using pipette.

Mountaineer drinking from water bottle

Couple enjoying break with dog

Young female photographer checking a chemical in photo studio

$Doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate unrecognizable female African American patient in clinic during coronavirus outbreak — Stock Photo$

Doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate unrecognizable female African American patient in clinic during coronavirus outbreak

Front view close up of a young Caucasian female potter sitting at a work table painting a colored glaze on a clay flask in a pottery studio

Workers pouring molten metal from flasks into moulds in foundry

$Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate unrecognizable mature African American woman patient in clinic during coronavirus outbreak — Stock Photo$

Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate unrecognizable mature African American woman patient in clinic during coronavirus outbreak

Vial with liquid for biochemical research, conceptual image.

Close-up of female photographer checking a chemical in photo studio

Close-up of male scientist writing on clipboard in laboratory

Girls having winter picnic on beach

Attentive university student doing a chemical experiment in laboratory

Close-up of touristic flask hanging on strap by female legs

Cropped unrecognizable doctor's hand holding showing coronavirus vaccine flask on pink background

Crop unrecognizable scientist with plant in plastic tube on yellow background in studio

Scientists experimenting together in laboratory

Ethnic doctor filling in syringe from bottle with vaccine preparing to vaccinate male African American patient in white background in a clinic during coronavirus outbreak

Female photographer using electronic device in photo studio

Friends drinking tea in van

Mountaineer in rugged terrain.

Close-up of male scientist experimenting in laboratory

Close-up of female scientist experimenting in laboratory

Cod liver oil capsules in conical flask.

Curious kids conducting science experiment

Mid-section of university student doing a chemical experiment in laboratory

Dried marijuana flower buds on table with analytical balance and moisture measuring device against protective glasses in lab

Man sitting on dock by the beach with a beer

Attentive male scientist experimenting in laboratory

Scientist in clean suit conducting scientific experiment in laboratory

Female scientist agitating yellow liquid in flask.

Male worker checking quality of gin in factory

Male scientist using microscope in laboratory

Accident during experiment with broken laboratory glassware flask.

Blurred unrecognizable medic in protective face shield mask and latex gloves with vial of coronavirus vaccine and syringe showing to camera while standing in hospital room

Female laboratory assistant using pipette.

Biology laboratory scientist hands working with cell culture in flask.

Bottles with color smoke

Mountaineer standing with water bottle

Scientist in protective wear pouring liquid in steaming flask

$Crop hands of anonymous doctor in latex gloves filling in syringe from bottle with vaccine preparing to vaccinate unrecognizable male African American patient in clinic during coronavirus outbreak — Stock Photo$

Crop hands of anonymous doctor in latex gloves filling in syringe from bottle with vaccine preparing to vaccinate unrecognizable male African American patient in clinic during coronavirus outbreak