mathematical formula mc2 squared written blue relatively dirty chalkboard chalk |
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| navigate by keyword : advertisement albert background billboard blackboard blank board chalk chalkboard class concept copy design education einstein element emc2 energy equation equivalence formula frame handwriting horizontal light mathematics mc2 message nobody notice noticeboard physics research school science space speed surface texture theory |
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| Mathematical formula e=mc2 squared written on a blue, relatively dirty chalkboard by chalk |
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