On page 13, is the name of the cooling disc "Da opoisc"? or is that a typo?
That is indeed a typo, its meant to say "This disc will cool a small space so long as it remains submerged in at least 2 inches of water. Outside of the water, the disc is cool to the touch, but doesn’t cool the air." I'll get the file updated to the latest version as it seems that was an export error on the one uploaded here.