<code id='897F476B12'></code><style id='897F476B12'></style>
      • <acronym id='897F476B12'></acronym>
      <center id='897F476B12'><center id='897F476B12'><tfoot id='897F476B12'></tfoot></center><abbr id='897F476B12'><dir id='897F476B12'><tfoot id='897F476B12'></tfoot><noframes id='897F476B12'>
      • <optgroup id='897F476B12'><strike id='897F476B12'><sup id='897F476B12'></sup></strike><code id='897F476B12'></code></optgroup>
        5. <b id='897F476B12'><label id='897F476B12'><select id='897F476B12'><dt id='897F476B12'><span id='897F476B12'></span></dt></select></label></b><u id='897F476B12'></u>
          <i id='897F476B12'><strike id='897F476B12'><tt id='897F476B12'><pre id='897F476B12'></pre></tt></strike></i>
           


   

   

   
   
   
   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
  
           
  
           
  
           
   
           
    
           
     
           
      
           
       
      
           
      
           
       
           
        
           
         
           
           
          
           
         
           
         
           
           
          
           
         
           
          
        
           
       
           
       
           
        
           
        
           
        
           
        
           
       
           
      
           
       
      
           
      
           
       
           
       
           
       
           
       
           
        
           
        
          
          00:00 
        
           
       
           
       
           
      
           
      
           
        
        
        
       
           
        00:00 
         
        00:00 
        LIVE 
       
           
        
       
           
        
           
        
           
        
           
        
           
       
           
       
           
       
           
        
        
        
        
        
        
        
        
        
      
           
       
    
    
      
           
       
           
      
           
     
           
     
           
       
     
           
     
           
      
           
      
           
      
           
      
           
       
           
      
           
      
           
      
           
       
           
       
          
         buffering 
       
           
      
           
      
           
       
           
        
           
        
          
          Replay 
        
           
       
           
      
           
       
      
           
      
           
       
           
       
           
        
           
        
           
        
           
       
           
      
           
      
           
      
           
      
           
      
           
       
           
      
           
     
           
     
           
      
           
     
           
     
           
      
           
       
           
        
           
       
           
       
           
        
          
          LIVE 
        
           
        00:00 
         /  
        00:00 
       
           
       
           
        
           
        
           
        
           
         
           
         
           
         
           
         
           
         
           
         
           
        
           
        
           
        
           
       
           
       
           
        
           
        
          
          LIVE 
        
           
       
           
       
           
        
           
        
          
          CC 
        
           
       
           
       
           
        
           
       
           
       
           
       
           
        
           
        
           
         
           
        
           
       
           
       
           
        
           
       
           
      
           
      
           
       
           
        
           
        
           
         
           
         
           
         
           
          
           
          
           
          
           
         
           
        
           
       
           
      
           
      
           
       
           
     
       
           
    
       
           
       
    
  
       
           
   
       
           
       
       
           
      
           
      
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       
           
       Opacity : 
        
      
           
     
           
     
           
     
           
      
           
  
     
           
    
           
    
           
    
           
     
          
       Share: 
     
           
      
     
           
      
      Copy 
     
           
      
    
           
    
          
      Close 
      
    
           
    
           
      
    
           
    
           
   
           
  
           
  
           
    
    
    
   
           
   
           
 
    
   
           
   
           
   
           
    
           
     
           
      
           
       
           
        
           
          
          
         
          
          focus 

          
          
            
          
          

           
           
        
           
       
           
      
           
     
           
    
           
    
           
     
           
      
           
      
           

                       
          knowledge  
          
                                   
                 
                                      author：comprehensive   
                                        
                                      
                                      -
 
browse：7
                                  
                                    
          
                                    
            
          
 
          Fingernails sometimes fall off when they’re damaged — like if they get stuck in a car door.
          That has to do with what’s known as the matrix, the spot at the bottom of your nail that’s responsible for growing your nail. Nails themselves are actually little plates of proteins called keratin. All of those proteins are connected, which is what makes one continuous nail.
          advertisement
          When your finger experiences a shock, like getting stuck in a car door, the matrix temporarily pauses the growth of the fingernail. That pause means the proteins are no longer connected. So the new part of the nail that starts growing isn’t connected to the old part that you could already see — which is why your fingernail falls off.
          We investigate the strange science of fingernails in the latest episode of our video series “Boddities.”
          Newsletters					
          Sign up for Morning Rounds
          Your daily dose of news in health and medicine.
          Please enter a valid email address.																Privacy Policy																																							
          Related:																			Watch: Episode 12: What would happen to your eyes if you looked at the solar eclipse?															
          Related:																			Watch: Episode 11: Why do bug bites cause bumps on the skin?															
          Related:																			Watch: Episode 10: What happens when skin gets sunburned?															
          Related:																			Watch: Episode 9: Why can’t teeth heal themselves?															
          Related:																			Episode 8: What makes metabolism fast?															
           
 
 
          

                              
          
                                 Previous article：

                                
                                          ChatGPT in medicine: STAT answers readers' burning questions
                                
                            
          Next article：  
                                      
                                          The biotech scorecard for the 2nd quarter: 12 industry events to watch
                                                                    
          

      
           
      
           
        
           
                                               
        
           focus 
           
                   
      
           
  
  
          
    
          
        
          
            
          
                                                     
                
          entertainment
          
                            
          
        
          
        
    
          

          

    

      
           
     
           


   
    
           
   
           
  
 

  
           
    
           
           
           
            
            Back To Top 
           
           
           
           

            
           
                                                                    
                 
          focus
           
                                      
            
           
          
           
                                                          
             
          hotspot
           
                             
            
           
            
           

                                                         
             
          hotspot
           
               
              
            
           
            
           
                                                         
             
          focus
           
                             
      
           
 
     
           
     
           
      
          
              AdobeDiagnosticerrors—thatis,overlookingadisease,ordiagnosingiterroneouslyorlate—areaknownoccurrence
             
           
      
          
        © 2013-2023.Company name All rights reserved.Site Map 
         WSS-More Templates  
             Guangdong ICP6933name