Even though you've made a sensible point, the fact remains that Yar'Adua is not a healthy individual (based on his medical history). Therefore, there is reasonable expectation that stories relating to his ill health has some manner of truth in them,. Surely you can't blame peeps for giving consideration to such articles as this is a case of "no smoke without fire".

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"The absence of evidence is not the evidence of absence."

"A river does not run through a forest without bringing down trees".