Theory is related to Mad. Mad is the opposite of Happy. you would Skip because Happy. Skip is a synonym of Interval. 
Scientist is related to Experiment. Trial is a type of Experiment. 
Theory <--RelatedTo--> Mad <--Antonym--> Happy <--MotivatedByGoal-- Skip <--Synonym--> Interval 
Scientist <--RelatedTo--> Experiment <--IsA-- Trial 