This was a favorite of myself and my 7 year old. I am VERY upset Discovery Kids left the air (about the only channel I would let him watch regularly) in favor of "the Hub" - which is much more "commercialized" - with fewer educational shows, as well. This series is now shown only once a week in the middle of the night!
TIVo it if you can - it is very educational, and my son can converse on topics he learned here that surprise other adults!!