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man writing scientific equations on a chalk board
Hand writing and drawing equation with marker on white board
MS Rear view of man writing math equations on blackboard
Scientist writing on the clear board
scientist writing on a clear board
Two young successful modern scientists in formal suit, glasses and medical gown writing, discussing and analyzing math equations on a chalk desk board. Middle static shot.
lab techs writing on the clear board
young Asian medical intern stops writing turns and smiles
Two young handsome successful scientists in formal suit and tie, spectacles and medical gown writing, discussing and analyzing math equations on a chalk desk board. Handy life camera. Close-up.
scientist writing on a clear board lens flare
Man writes equation on chalkboard
Bald Mathematician Underlining an Equation on a Board