Tricepula,
Ethylene glycol is radiator coolant, Propylene glycol is approved by the FDA for use in food processing equipment. Two years of chemistry? Hmmmm... Don't stop taking class just yet....You could drink Propylene glycol, but ethylene glycol will kill you. Just ask the boot leggers in France about that one, around five years ago they had to dump a whole bunch of wine some idiot made the mistake of useing it to sweeten up a whole batch of wine because the sugar content of the grapes was low that year and the amount of sugar needed to raise the sweetness was considered too expensive, both propylene and ethylene glycol are super sweet. So they used ethylene by mistake. Made alot of people deathly ill, it shuts your kidneys down. Hey you want to get a good deal on some cheap ass french wine? Call me.