doping a semiconductor
"Semiconductors can be turned into conductors by a process called doping. Doping a semiconductor is like adding a car pooling lane to an otherwise gridlocked motorway. Electrons from dopant atoms can move freely up and down the almost empty extra lane while the other electrons sit glumly in the traffic jam. "
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.