Experimental Testing
Concept · Stellaris 4.5.2
Experimental Testing in the Stellaris encyclopedia: Grants a random technology insight upon completion.
Experimental Testing in the game's words
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Grants a random 
technology insight upon completion.
By gathering imprisoned … and subjecting them to scientific experiments, we can significantly increase the pace of our technological advancement.
Source: common/game_concepts (concept_experimental_testing_corporate) and localisation/english, Stellaris Cygnus v4.5.2 (9776).