| Speak Up! Communicating Confidently | 
  
    
    
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  | Special Effects | 
  
    
    
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    4.4   | 
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  | Special Forces Careers | 
  
    
    
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  | Speed Racers | 
  
    
    
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  | Speed Skating | 
  
    
    
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    6.1   | 
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  | Sport Bikes | 
  
    
    
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    6.7   | 
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  | Sports Champions | 
  
    
    
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    5.5   | 
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  | Sports Heroes of Ancient Greece | 
  
    
    
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    4.9   | 
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  | Sports Jokes, Riddles, and Games | 
  
    
    
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  | Sports Journalism | 
  
    
    
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    7.5   | 
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  | Sprints, Hurdles, and Other Track Events | 
  
    
    
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    6.6   | 
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  | Star Spotters: Telescopes and Observatories | 
  
    
    
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    6.2   | 
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  | Steeplechase | 
  
    
    
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    4.8   | 
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  | Stephen Hawking | 
  
    
    
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  | Steroids | 
  
    
    
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    8.6   | 
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  | Steve Nash | 
  
    
    
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    6.4   | 
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  | Stinky Skunks and Other Animal Adaptations | 
  
    
    
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    5.7   | 
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  | Stone Age Geometry: Lines | 
  
    
    
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    4.4   | 
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  | Stone Age Geometry: Spheres | 
  
    
    
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    4.5   | 
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  | Stone Age Geometry: Squares | 
  
    
    
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    4.1   | 
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  | Stone Age Geometry: Triangles | 
  
    
    
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    4.3   | 
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  | Stone Age Science: Buildings and Structures | 
  
    
    
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    5.2   | 
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  | Stone Age Science: Energy and Movement | 
  
    
    
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    5.2   | 
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  | Stone Age Science: Materials | 
  
    
    
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    5.1   | 
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