The keepers of the Great Seal of the United States, the familiar emblem on the back of the $1 bill, want you to know what it is not. It is not a sign that Freemasons run the country, it has nothing to do with the occult, and it does not contain clues to a fabulous hidden treasure.

Not that the Seal's symbols — the all-seeing eye, the unfinished pyramid, the Latin phrases, the bald eagle clutching an olive branch and arrows and the number 13 — aren't powerful.

They are, historians say. Yet their meanings have been misidentified, misunderstood and misrepresented almost since the Continental Congress first commissioned the Seal in 1776.