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A comment on China now the most prolific contributor to physical sciences, engineering, math. Parent comment
Also, here is a Wikipedia link to what GDP PPP (Gross Domestic Product Purchasing Power Parity) actually is [2]
[1] http://www.wolframalpha.com/input/?i=US,+China+GDP+PPP [2] https://simple.wikipedia.org/wiki/Purchasing_Power_Parity
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Also, here is a Wikipedia link to what GDP PPP (Gross Domestic Product Purchasing Power Parity) actually is [2]
[1] http://www.wolframalpha.com/input/?i=US,+China+GDP+PPP [2] https://simple.wikipedia.org/wiki/Purchasing_Power_Parity