Spruill, Steven G. "The Janus Equation"
Divergence: 1963 CE
What if: John F. Kennedy wasn't assassinated.
Summary: C. 2200, a man trying to create a time machine in a world dominated by multi-national corporations is over-aggressively recruited by a competitor.
Published: In Binary Star No. 4 (ed. James R. Frenkel), Dell 1980 (044010821X).