nitrogen cycle
"The nitrogen cycle is like a French movie; it's difficult to understand, overly-complicated, and in desperate need of translation. One reason the nitrogen cycle is so tricky is the terminology. Denitrification, nitrification, ammonification, nitrogen fixation: they all blur together like the colors in an impressionist painting."
"The nitrogen cycle is like the phosphorus and carbon cycle because they both show how important substances are moved around in the environment."
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.