theory relativity equation mc2 handwritten chalkboard blackboard |
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| navigate by keyword : activity aid art blackboard board calculation chalk chalkboard color concept creativity drawing education emc2 energy equation equipment equivalence formula frame handwriting handwritten horizontal image innovation intelligence learning mass mathematic mathematical mc2 number people photography physics relativity research school sketch solution speed study symbol teaching text theory university visual writing |
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| Relativity theory E mc2 equation mass energy equivalence. Equation E mc2 handwritten on chalkboard or blackboard |
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