Inventions by Srilankans
Friday, September 4, 2020
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<iframe width="688" height="387" src="https://www.youtube.com/embed/UsIfxG3_Lkg" frameborder="0" ...
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https://books.google.lk/books?id=IOEDAAAAMBAJ&pg=PA112&lpg=PA112&dq=why%20diamond%20gem%20inclsions%20do%20not%20give%20a%20star...
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https://en.wikipedia.org/wiki/Pearl