"An electron carrier is like a moving van constantly loading and unloading electrons or hydrogen atoms"
Before hoses, water was moved by a series of people handing buckets of water to each other, down a line from the water's source to the fire. An electron carrier is like a person in this line.
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.