That theory, a concept first proposed by Albert Einstein and often reiterated by British astrophysicist Stephen Hawking, seeks to find a single set of equations that can explain all the fundamental forces in the universe: gravity, electromagnetism, and the strong and weak interactive forces among subnuclear particles.
gravity is not a fundamental universal force.
( z1 force :polarity - :mod ( z2 universal ) :mod ( z3 fundamental ) :domain ( z4 gravity ) )