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            The US Military Gave Out Shark Repellent For Years
                
                    
                        
                            Season 5
                        
                    
                    
                        
                            Episode 94
                        
                    
                
            
            
            People have been developing different forms of shark repellent for decades--the military even issued a chemical shark repellent called “Shark Chaser” to pilots, sailors, and astronauts(!) from the end of World War II through the start of the Vietnam War. Thing is… it didn’t really work. Learn why they bothered passing it out--or even created it in the first place.
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            An email from a subscriber made us question everything we thought we knew about trees.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          21:33
        
      
    
  
  
                    
                
            The 15 ways that color happens. It's all about the electrons. Well, almost.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          12:07
        
      
    
  
  
                    
                
            This element powers glow in the dark exit signs, keychains, and costs $30,000 per gram.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          9:53
        
      
    
  
  
                    
                
            Scientific fraud rocked the Alzheimer’s research community. Did it help point to a cure?
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          12:54
        
      
    
  
  
                    
                
            Alex Dainis explores whether or not your milk needs to be pasteurized. Yes, it really does.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
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            George tests a revolutionary new way to stick stuff together.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
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            Sometimes the difference between life-saving drug and deadly side effect is chirality.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          17:23
        
      
    
  
  
                    
                
            What happens when you eat morel mushrooms.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          10:31
        
      
    
  
  
                    
                
            WARNING: this video contains incredible macro footage of supercooled water droplets nucleating ice.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          13:12
        
      
    
  
  
                    
                
            Let’s dive into the science behind ocean alkalinization!
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          16:56
        
      
    
  
  
                    
                
            Discover why curdled milk is the key to the best cocktail you’ll ever taste.
        
        
    
    
                        
  
  
    
      
    
  
  
    
      
        
          10:13
        
      
    
  
  
                    
                
            Scientists are finding the building blocks of carbon ring structures… out in space!