Science is related to Laboratory. you are likely to find Researcher in/at/on Laboratory. Researcher is a type of Worker. Missionary is a type of Worker. 
Cheap is the opposite of Value. Value is related to Half. 
Science <--RelatedTo--> Laboratory <--AtLocation-- Researcher --IsA--> Worker <--IsA-- Missionary 
Cheap <--Antonym--> Value <--RelatedTo--> Half 