Also interesting that the real author of the fast InvSqrt ( Greg Walsh) was working at Ardent when he invented it, which is the same company that Steve Blank has been blogging about recently.

Walsh worked on the Xerox PARC Bravo word processor with Charles Simonyi and Ben Wegbreit. Followed Wegbreit to Convergent, Ardent and E.piphany. Brilliant architect and coder.

It's a shame that that is not linked from the original article.