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School teacher thinking about liquid in test tube

Stock Photo:
Image ID: 83952253
Copyright:
Small
500x500 6.9"x6.9" (72dpi) 49 KB
Med
1000x1000 3.3"x3.3" (300dpi) 144 KB
Large
4096x4096 13.7"x13.7" (300dpi) 1.7 MB
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