Does anyone else on this board know that Doc Savage............... ......

Yeah, we know that.
This is pretty well known .
The whole idea of the Fortress Of Solitude was out and out swiped from Doc Savage in the late 50's. The editor of Superman at the time, More Weissburger, was an assistant editor at Street and Smith when the Savage novel "fortress of Solitude" as published in 1938. The Fortress did not enter the Superman saga until 1958, ten years after Doc Savage had ceased publication.
For further details, see the first of the current series of Doc Savage reprints, which goes into detail on the influence..and at times out and out swiping...that Savage had on the man of steel.
And there is a whole other story on the influence that Savage's Street and Smith stablemate,The Shadow, had on Batman....

I'll Teach You To Laugh At Something's That's Funny
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Thanks for the interesting facts about Doc Savage. I am not very familiar with the character, having only began to explore it thanks to Dave Stevens having used some of the characters (Ham and Monk) in his comic book of The Rocketeer. I knew that Doc preceded Superman and Batman, just like The Shadow does, but I never realized that so much had been taken from him, such as the Fortress of Solitude. Anyhow, thanks for posting the interesting facts!

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Whose idea was it for the word "Lisp" to have an "S" in it?

Was one of many inspirations for Superman (along with Philip Wylie's "Gladiator"). And of course Greek Mythology.

But more interestingly is that Ron Ely is the only actor ever to portray BOTH Doc (Clark) Savage AND Superman. Yes It's true. In two episodes of the "Superboy" series, entitled "The Road to Hell. Parts 1 and 2", he plays the adult Superman whom Superboy accidentially encounters due to a rip in the time/space continium.

Also, it seems for Batman. I've been reading the first couple of volumes of the "Batman Chronicles", covering the origin in May of 1939 through late 1940, and I found a number of Doc Savage connections.
1) Batman's "utility belt" in the early stories is often a source of tiny gas bombs and grenades.
2) On one occasion, that I noticed, Batman reveals that he is wearing a bulletproof garment... It is clear from his costume that it would have to be much like Doc's lightweight bulletproof underclothing, totally unlike any real-world body armor. This doesn't seem to have been adopted as standard Batman attire, based on him getting shot in a couple of other stories.
3) In Batman no.1 (Spring 1940) is an untitled story (called in the collection, "Professor Hugo Strange and the Monsters") which contains enough elements of the Doc Savage novel "The Monsters" to leave little doubt that Bill Finger, or somebody read and borrowed from it. In the comic, a mad scientist grows lunatics (not a gang of thugs) into fifteen foot giants, which are provided bulletproof clothing (not metal armor) and driven to the site of crimes in a moving van. Of course the finale of Batman flying a plane to machine-gun the last giant off the top of a tall building with a familiar sort of spire... That's stolen right outa "King Kong".
4) On at least one occasion, Batman used the ultraviolet lamp and tracking-powder that Doc was fond of.

The Italian movie character Maciste, created in the 1900s, might have been another important source of influence on the making of doc savage.

Actually both Doc Savage and Superman were based in part on two different characters created by author Philip Wylie:
Doc Savage was based on the Savage Gentleman and S was based on Gladiator.