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| navigate by keyword : algorithm apple blackboard board book books chalk chalkboard chalks class classroom college concept desk educate education educational einstein elementary food formula fruit green high horizontal idea indoors information interior knowledge learn lesson literature mathematics mc2 message nobody object physics primary relativity research school stack study teach text textbook theory words |
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| Einstein's formula on a chalkboard with an apple, a book and some chalks. |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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