So far, news of Kim Jong-Un's alleged incapacitation have been reported first in tabloids (including Fox News), having originated with the mere speculations of one former official of the South Korean government. This same official claims he received the news from an anonymous source in China. Thus, the news cannot be directly verified, and remains only a rumor.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.