كل ما في الحياة يتكون من مادة، بدءًا من جسمك وبقية أفراد عائلتك، إلى طعامك المفضل، وحتى كوكب الأرض وبقية الكون. تعرف على المادة المكونة لكل ما يحيط بك.
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