The mainstream can dispute ...yet it does in common sense appear via evidences
Numbering in the over 5000 skeletons of giants 7- 9ft found in the USA
Mound builder culture...which was coast to coast.
There is as Dewhurst notes giants 10 - 12 ft....and larger.
The Elongated skull varies as with the Gigantism...
That the Elongated skull continues in humans less than 7ft tall and not regarded
May be a genetic factor indicating the intermixed of races thru time.
Giants going extinct only recently as history goes.
Question now is....how intelligent were these Giant races?
The past Earth ages of planetary chaos may indeed explain the decline of the Giants,
Yet it may have more to do with Earths Electrophasic state,
Which includes Atmospheric pressure.
Gigantism is history going back to the Dinosaurs.
Earth may have been smaller diameter. ...and expanded thru the ages.
With Atmospheric pressure changes. ..and Electrophasic,
Which may influence...trigger DNA changes.