(AP) -- Phil DeVore pulls a folded piece of aluminum from a murky pond. The aluminum looks like a piece of siding that's blown off a building, but DeVore knows it's much more valuable than that. He slips a rubber band off the aluminum and unfolds it. He likes what he sees -- 50 or 60 glistening black leeches. They're your common ribbon leeches, Nephelopsis obscura to aquatic biologists.
After its initial use, cooking oil can be refrigerated or frozen and reused for another six hours of cooking (see References 2). Don't reuse cooking oil if it smells rancid or you can't heat it without smoke developing, as this indicates significant deterioration (see References 1 and 4).
There are quite a few kinds of vegetable oils, like soybean oil, sunflower oil or peanut oil. Their shelf life, however, is quite similar to one another. As long as your vegetable oil is unopened and stored properly, it should be fine for at least two years, probably for a lot longer. Once youâll open the bottle, the oil in it should be fine for at least a year. If youâll store vegetable oil the right way, youâll prevent it from going bad for a longer period of time, even much longer.