E=mc2 equation for Albert Einsteins theory of relativity written on a blackboard
Schlüsselwörter
physics,
equation,
formula,
einstein,
theory,
blackboard,
blackboard,
written,
closeup,
closeup,
text,
cognition,
closeup,
nobody,
no people,
indoor,
inside,
horizontal,
chalk,
education,
concept,
writing
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