I have already been "on board" with the humidity/ pyramiding relationship but I still enjoyed reading about it on the reptile channel.
Check it out if you are interested
http://www.reptilechannel.com/turtles-and-tortoises/tortoise-care/pyramiding-in-tortoises.aspx
Check it out if you are interested
http://www.reptilechannel.com/turtles-and-tortoises/tortoise-care/pyramiding-in-tortoises.aspx