Watchers

• 

  Sol Cribbs

  https://inventmag.com/%eb%a1%9c%eb%98%90%eb%8b%b9%ec%b2%a8%eb%82%b4%ec%97%ad%ec%9d%98-%eb%86%80%eb%9d%bc%ec%9a%b4-%ec%84%b8%ea%b3%84-%ed%94%84%eb%a6%ac%eb%98%90%ec%99%80-%ed%95%a8%ea%bb%98%ed%95%98%ec%84%b8%ec%9a%94/