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smart teacher writing various high school chemistry formula with light bulb ( symbol of idea and solution )

Stock Photo:
Image ID: 109571792
Release Information:
Signed model release filed with Shutterstock, Inc
Copyright: Dusit
Small
500x463 6.9"x6.4" (72dpi) 182 KB
Med
1000x925 3.3"x3.1" (300dpi) 528 KB
Large
4000x3700 13.3"x12.3" (300dpi) 4.1 MB
Super
8000x7400 26.7"x24.7" (300dpi) approx.10.4 MB
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