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    It's Okay to Be Smart
            The Romantic Lure of Moonlight
                
                    
                        
                            Season 5
                        
                    
                    
                        
                            Episode 40
                        
                    
                
            
            
            Organisms of all shapes and sizes synchronize their behaviors using biological clocks. Some keep pace with the daily rising and setting sun using circadian rhythms. Others use annual cycles or the changing seasons as their cue. But many animals use moonlight and Earth’s lunar cycle to run their biological clock. Do humans do the same thing, with things like menstrual cycles?
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            This is one of the weirdest mysteries of human evolution: Why do we have grandmas?
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
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