Ένα σχολιαρόπαιδο που φοράει γυαλιά προστασίας και κάνει πειράματα χημείας στο δημοτικό. Μαθητής με σωλήνες εξοπλισμού στο εργαστήριο - Φωτογραφίες & Εικόνες Αρχείου

School boy wearing protection glasses with dirty face doing chemistry experiment in elementary science class. and measuring colorful liquids Clever pupil in lab

School boy wearing protection glasses doing chemistry experiment in elementary science class. Pupil with equipment tubes in lab during test

Smiling boy in goggles holding bottle near blurred test tubes during chemical experiment in laboratory

School boy wearing protection glasses doing chemistry experiment in elementary science class. Pupil with equipment tubes in lab during test

School boy wearing protection glasses doing chemistry experiment in elementary science class. Clever pupil looking at camera and smiling in lab during test

School boy doing chemistry experiment measuring chemical liquids in elementary science class. Clever pupil analyzing results of test in lab

School boy with dirty face wearing protection glasses looking at liquid in glass during chemistry experiment in elementary science class and smiling. Clever pupil in lab during test

School boy wearing protection glasses with dirty face doing chemistry experiment in elementary science class. and measuring colorful liquids Clever pupil in lab

Smart girl doing scientific chemistry experiment wearing protection glasses, holding bottle and measuring blue liquid. Schoolgirl with chemical equipment on school lesson

Schoolboy gown and gloves watching chemical experiment in tube in chemistry lab

Little smarl girl in white gown in chemistry lab doing an experiment

Two schoolchildren in white gowns watching chemical experiment in lab

Schoolboy gown and gloves watching chemical experiment in tube in chemistry lab

Two schoolchildren in white gowns watching chemical experiment in lab

Smart girl during scientific chemistry experiment wearing protection glasses, holding bottle with orange liquid. Schoolgirl with chemical equipment on school lesson portrait

Smart girl doing scientific chemistry experiment wearing protection glasses, holding bottle and measuring blue liquid. Schoolgirl with chemical equipment on school lesson