Like when you want to protect yourself and you ask about it and the skeptics tell you to wear a tin foil hatWhat exactly does that mean?
For God's sake don't take anything from an old ovenThat could contain Asbestos which is forbidden in any school setting where children are involved.
This really depends on how hot the whole thing is going to getIf the temperatures aren't too high, you could use the glass wool insulation normally used to insulate loftsYou should be able to get hold of this from a hardware shopFor higher temperatures mineral wool / rockwool might be better, but perhaps harder to get hold ofRS sell it in the UK -couldn't say for the US marketAnother trick you could try is using a layer of aluminum foil either side of your insulation to hold a layer of air between the foil and the insulation and reflect radiated heat back inThis can be remarkably effective in some situations.
ALL farmed food is by definition genetically-modified.unless you live your life skipping through the jungle eating fruits from the wild vines and slaughtering small wild mammals for protein, EVERYTHING YOU EAT is genetically-modified(The tin-foil hat is a reference to covering your head with aluminum foil prevent beings from being able to telepathically read your mind, and that notion was invented by Julian Huxley in his 1927 early Science fiction story The Tissue-Culture King)
