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.
Stephen has 2 e's.
Stephen does have two letter e's in it. The system was confused by the context.
( z1 have :ARG0 ( z2 person :name ( z3 name :op "Stephen" ) ) :ARG1 ( z4 score-on-scale :ARG1 "E" ) )