polymerase chain reaction
"The polymerase chain reaction is like a copy machine. Like a copy machine, the polymerase chain reaction can create hundreds of identical copies of the same piece of DNA."
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.