"Alton Brown from the Food Network used the analogy of a train car. An unsaturated fat is like a car with lots of empty seats. A saturated fat is like a car with all the seats filled. A trans fat has most of the seats filled, usually with hydrogen, hence the term "partially hydrogenated". An unsaturated fat can collect unsavory passengers, like sulphur molecules, which impart that rancid flavor that everyone hates. Trans fats avoid collecting passengers, dont get rancid, so the food processors love them."
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.