"Good article"? I'd say it is a great article! Excellent advice and perspective on a really tricky place for the uninitiated.
I particularly agree with the "hike at night" advice. I once joined a project (archaeological dig) in progress near Phantom Ranch. I left the South Rim at 2:30AM. I had plenty of light even without moonlight....
I think that the rescues mentioned in the article do not include the "drag outs," where an exhausted hiker on the corridor routes picks up the phone and pays for a mule ride back to the rim....
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Geezer in Chief