What is the Rivalry of Black Mesa and Aperture Science? "Black Mesa and Aperture Science were rivals as a result of competing for US Government contracts, some more specifically into portal technology research. Aperture started out on top in 1950s selling shower curtains to the US Military, but slowly began to loose the race after poor leadership and business decisions from Cave Johnson. Black Mesa later came out on top, putting financial hardships on Aperture Science's ability to compete."
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