I just heard a report on National Public Radio about genetic engineering of foods. In the course of the report, they interviewed a scientist who mentioned that during World War II, what we call canola oil was used as an industrial lubricant. It was inedible because it contained significant quantities of two substances (unnamed) that made the oil inedible. However, after the plants from which the oil was derived were bombarded by chemicals and radiation, these two offending substances were removed from the plants. Oil from the plants could then be "safely" consumed. Troy G.