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Cropped view of a scientist in lab coat and protective medical gloves, holding PH indicator strip, litmus or reagent paper for measuring alkalinity and acidity. Loupe, labware on table in laboratory Details: the hands of a laboratory assistant in protective gloves drip a transparent liquid from a graduated pipette into a test tube with a chemical powder and observe the ongoing chemical reaction Little schoolgirl in safety goggles and white lab coat, student in chemistry class, conducts scientific experiments in the school laboratory. Back to school. Child scientist study science. Environmental pollution. Selective focus on hands in medical gloves of burred female chemist, laboratory assistant examining sample of contaminated water, dipping strip of litmus paper into test tube Selective focus on a glass graduated laboratory pipette in the hands of a smiling female clinical research laboratory worker, titrating a chemical reagent into a test tube while conducting experiment Selective focus on gloved hands of lab assistant using reagent paper, conduct a PH test of a substance in Petri dish, in a clinical research laboratory. Measurement of acidity, alkalinity of chemicals Close-up portrait of a positive multi-ethnic woman wearing safety goggles and lab coat smiling, looking at camera, holding a pipette and flat-bottomed flask with a chemical solution, in a laboratory Portrait of multi-ethnic experienced scientist in lab coat, sitting at a table with test tubes, graduated cylinder, flasks with chemical liquid and digital tablet, working in a a science laboratory Caucasian woman scientist chemist, employee of a clinical research laboratory, experienced pharmacologist studies the properties of the drug in the test tube. Pharmacologist synthesizes a vaccine Details: Hands of scientist in gloves, writing in notepad chemical formula and the conclusion of science experiment carried out in laboratory, sitting at table with test tubes and laboratory glassware Close-up. Using a glass lab pipette and dripping a few drops of reagent into test tubes on tripod, over a blurred chemist scientist, doing chemical experiments and laboratory analyzes. Selective focus Selective focus on test tubes with chemical fluid substances, next to laboratory glassware over blurred scientist pharmacologist or lab technician, making researches and analyzes in medicine field. Multi-ethnic woman scientist, in lab coat and safety eyeglasses using a glass stick mixing the blue solution in a flat bottomed flask, while conducting a chemical experiment in a science laboratory African American woman scientist chemist, clinical researcher working in a science laboratory, doing some research with dropper and blue liquid in a flat bottomed flask. Pharmacology. Medicine Selective focus on test tube with reagent in gloved hand of blurred woman scientist chemist experimenting chemicals, sitting at table with lots test tubes and graduated labware in research laboratory Selective focus on a glass laboratory flask in the hands in surgical sterile gloves of blurred scientist, lab technician, pharmacologist pouring pink liquid substance through a funnel into a test tube Smart Caucasian schoolgirl watching fascinating wonderful chemical reaction, between multi-colored chemicals and reagents, taking place in a test tube that she holds in her hands at a chemistry lesson Charming Caucasian talented little girl with two ponytails, first grader sitting at a table and painting picture with watercolors and paint brush. Drawing. Art class. Side portrait of an adorable pretty child, beautiful European little girl of preschool, in a yellow t-shirt enjoys watercolor painting at home veranda. Creative art class for talented children Charming Caucasian schoolgirl, a little chemist, standing at a table with glassware for a chemical laboratory and observing a chemical reaction taking place in a test tube, which she holds in her hand European smart preschooler girl in protective eyewear and white lab coat, future scientist chemist learns chemistry, sits at a table with test tubes with rainbow color chemical solutions on a tripod Adorable Caucasian preschooler girl in wireless headphones, concentrated little artist, drawing picture, using watercolor paints. Kids entertainment, hobby and education concept. Art master class. Thoughtful Caucasian little girl in safety goggles and white lab coat, concluding science experiments in chemistry class, reading text and holding a flat bottomed flask with green chemical solution Inquisitive baby girl, preschooler in protective glasses and a white lab coat holds a test tube and watches the chemical reaction taking place in it during a scientific experiment. Learning Chemistry Handsome Caucasian teenager, smart schoolboy in laboratory protective clothing, using a pipette, drips a reagent into a test tube, stands next to his classmate watching a going on chemical reaction Pleasant multiethnic woman, a chemistry teacher explaining chemical formula to schoolchildren during science experiments in school lab. The study of chemistry. Back to school. Open for new knowledges Adorable little girl wearing wireless headphones and a yellow t-shirt, listens to the music and draws picture while learning watercolor painting. Art class. Kids entertainment, hobby and leisure Cheerful Caucasian little girl of preschool, in orange top sitting at a table in the home veranda and drawing picture with paint brush and watercolors, enjoying art class for talented children Adorable talented child, little girl of preschool age, sitting at a table and mixing paints with a paintbrush while learning painting picture at art class. Kids education and development. Drawing. View from above of a little girl, talented child drawing picture with a paintbrush and watercolour paints. Drawing, artistic creativity concept. Education, children's entertainment Close-up portrait of adorable European preschool child, cute baby girl in audio headset, painting picture with brush and watercolor. Creativity courses for children, talented little artists, painters Close-up of beautiful cute child, adorable Caucasian little girl holding paintbrush and drawing picture with watercolour paints. Art courses. Painting activity. Kids education and development concept Focus on the hand of a little girl artist, holding a brush and mixing watercolors on a palette while drawing picture on paper during a creative art painting class. Children's entertainment concept Happy smiling little girl sitting at table and mixing paints with a paint brush while painting picture with watercolors. Kids education and development. Drawing. Art class for telented children Caucasian child, elementary age girl sitting at a table and painting picture with watercolors and paintbrush. Kids education and development. Drawing. Art classes and courses for telented children Top view of a Caucasian little girl, talented child drawing picture with paintbrush and watercolors. Painting art class for kids Funny European little girl with two funny ponytails wearing an orange top, sitting at a table with her painted picture, during a watercolor painting art class and grimacing looking at the camera Emotional close-up portrait of a Caucasian little girl with two funny ponytails sitting at a table with her drawn picture, during a watercolor painting art class and grimacing looking at the camera Cheerful European preschool child, adorable baby girl in audio headset, painting with brush and watercolor. Creativity courses for children, talented little artists, painters Beautiful cute child, adorable European little girl holding a paintbrush and drawing picture with watercolour paints. Art courses. Painting activity. Kids education and development concept Close-up portrait of a beautiful European little girl of preschool age with two ponytails, in an orange top, sitting at a table with a paintbrush in her hand and painting with watercolors View from above of a Caucasian happy little girl drawing a beautiful picture with a paintbrush and watercolors, sitting at a table with palette for mixing watercolor paints, in the home veranda Cheerful elementary age girl, smiles looking at the camera while painting picture with watercolors and paintbrush. Kids education and development. Drawing. Art classes and courses for telented kids Happy child, Caucasian little preschool age girl with two funny ponytails, raising her arms while sitting at a table with drawn pictures and cutely smiles looking at the camera, enjoying art class Adorable child, elementary age girl sitting at a table and painting picture with watercolors and paintbrush. Kids education and development. Drawing. Art classes and courses for telented children Adorable preschooler girl, smiles looking at the camera while painting picture with watercolors and paintbrush. Kids education and development. Drawing. Art classes and courses for telented children Caucasian cute funny little girl of preschool age, cutely smiles, looking at the camera while learning watercolour painting class. Drawing. Peinture. Creativity. Hobby and leisure. Kids entertainment European cute little girl smiles, holding paintbrush and drawing picture while learning watercolour painting class. Drawing. Peinture. Creativity. Hobby and leisure. Kids entertainment and development Homeschooling Caucasian little girl in white lab coat learning about science, pouring reagent solution from flask into a test tube, watching fascination going on chemical reaction. Learning chemistry Caucasian smart nerd schoolboy in protective goggles and white lab coat holds a test tube with green chemicals and reagents and watches the taking place chemical reaction, expressing stupefaction