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This is the theory of Metallicman, an American living in China: World War 3 has started. It’s a biochemical war.
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Metallicman unleashes his theory of The USA and China at war, what he calls World War 3, a war wagged with Covid-19.
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The basic assumption, that both the US and China modified or mutated Covid-19 into strains targeted at each other, is unsubstantiated. Metallicman resorts to guess work at best. Pure speculation. Covid-19 is natural. That’s a scientific fact.

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As for mutations:
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When partial truths and misinterpreted facts are intertwined in a conspiracy theory of such proportions, you can’t unravel the threads, merely accept or reject his basic tenet: Americans are fools and the Chinese are wise, and China will win World War 3.
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The USA and China are now entangled in the Thucydides Trap; this is the entire story.
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This goes against all the prophecies which expect WW3 to originate in the volatile Middle East.