Elemental
The Ancient Greeks saw the world comprised of four elements – Earth, Air, Fire, and Water (with Aristotle throwing in a fifth, Aether, for good measure) that were thought to explain the nature and complexity of all matter and to be essential to life. Times have changed. We now have atomic theory, with atoms classified into more than a hundred chemical elements. Yet echoes of the old theory reverberate to this day and scientists admit we still don’t know everything; there is still some mystery in our world.