"Imagine you find a bag of pennies. Some pennies are new and shiny. Others are old and oxidized (chemically bonded to oxygen in the air - kind of like rusting). Some are so old they are worn down."
The link is a paper that
uses the a reference to a bag
of pennies to demonstrate how
atomic mass is calculated. a
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.