"Biomass can be used to make an energy-rich gas called biogas. Biogas is like the natural gas we use in our stoves and furnaces."
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.