Sometime it's difficult to remove a lid from a jar. If you run hot water over a metal lid and then dry the lid, it becomes much easier to remove. The hot water is expanding the metal lid making giving it a looser fit, which makes it easier to turn and thus remove.
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.