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Research scientist writing physics diagrams and formulas with chalk on blackboard

Stock Photo:
Image ID: 117707407
Release Information: N/A
Copyright: Shawn Hempel
500x381 6.9"x5.3" (72dpi) 126 KB
1000x762 3.3"x2.5" (300dpi) 372 KB
4747x3619 15.8"x12.1" (300dpi) 1.7 MB
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