Midnight is related to Stroke. Stroke is related to Brain. Hearing requires Brain. Hearing is related to Laugh. 
Research is a type of Investigate. Research is related to Stem. 
Midnight <--RelatedTo--> Stroke <--RelatedTo--> Brain <--HasPrerequisite-- Hearing <--RelatedTo--> Laugh 
Investigate <--IsA-- Research <--RelatedTo--> Stem 