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Research scientist writing maths diagrams and formulas with chalk on blackboard

Stock Photo:
Image ID: 119182942
Release Information: N/A
Copyright: Shawn Hempel
353x500 4.9"x6.9" (72dpi) 126 KB
705x1000 2.4"x3.3" (300dpi) 367 KB
3328x4721 11.1"x15.7" (300dpi) 1.5 MB
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