RobRoy
It's just stuff - but fun
Regularly I learn new things here on AK.
DNU:
Thanks @robRoy
DNU:
Water in hay causes it to oxidize. Oxidation generates heat. You can actually open up a bail of wet hay that has been setting for a while and it's so hot inside it will burn your hand. If it is hot enough and gets an oxygen supply, it will burst into flame. It's actually what causes most barn fires.