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📁 [Xin Jin Meng (xinjinmeng)] Helium Discovery Day
On August 18, 1868, Pierre Jules César Janssen employed a prism to find a yellow light that appeared to indicate sodium, but he found out th...
#️⃣artist:xinjinmeng #️⃣Dragon #️⃣floating #️⃣Inflation #️⃣oc:xinjinmeng #️⃣Scraps #️⃣Xin Jin Meng #️⃣xinjinmeng
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