I recently took in a lecture by Neil Turok of Cambridge University. The lecture referred to an equation of all known physics to date. Turok comments that it is currently incomplete but explains millions of experiments with only 18 free variables.
Without further ado, here is the equation:

Here is a link to the lecture:
http://www.perimeterinstitute.ca/index.php?option=com_content&task=view&id=551&Itemid=568&lecture_id=6462
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