(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.
Storing Used Oil. Used oil can be successfully stored in a cool, dark place for up to a month. Refrigeration or freezing increases the oilâs lifespan by several months. The oil may become cloudy during storage but this is not harmful and the oil will become clear upon reheating.
Shelf life of sesame oil. It has been studied and stated that the storage duration of sesame seed oil is six months. It is hard to tell whether the oil became rancid by tasting it only, as the taste does not differ much. However, Ehow has some tips on finding out whether the oil went rancid, like heating it in order to determine the rancidity through scent.