Any people old enough to remember Admiral Byrd and the hollow Earth being taught in school?

Answer 1

I am not old enough to remember this but I did do the research and found some sources for you to look at.
This one is interesting...
http://members.iimetro.com.au/~hubbca/hollow_earth.htm
http://www.thehollowearthinsider.com/news/wmview.php?ArtID=18
http://www.erks.org/update5.htm
http://www.ourhollowearth.com/Bernard/Foreword.htm
Hope these help...