#chemical elements

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BBC World Service

A close look at chemical elements, the basic building blocks of the universe. Where do we get them, what do we use them...

#chemical elements #building blocks #universe #economy

US Education

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ຊື່ຫຼິ້ນຕ້ອງມີຢ່າງໜ້ອງ 2 ຕົວອັກສອນ.