`  ==R.P. Williams== How does one mark a reference as questionable.  While I was able to find a blog mention of the ``feat`` of him running 9.0 , the person writing the blog was unnamed and gave reference to an out of print book ``The Super Athletes`` by David Willoughby, which I later tracked to being published in 1970.  Further that:  another reference to the book, commented on by Garry Hill, noted editor of Track and Field News responds ``Willoughby's book, while a fascinating read about feats of strength, is, to say the least, largely the work of a guy given to wild flights of fantasy in comparing people across the ages. Very little science involved. Take it with many huge grains of salt.``  Later in the same blog, he cites the unbelievability of this one mark as substance for such a statement.  I have not stepped out on a limb to delete the item entirely, but certainly more documentation, beyond even Willoughby to his original sources sounds appropriate here.  `