Have you ever made a huge mistake at work, hoping no one would ever notice it? That's what happened in 2014, when an employee at the Egyptian museum knocked off the beard of Tutankhamun's mask and glued it back on. This mask was discovered in 1922 and is considered one of the 10 symbols of our human civilization. The plan worked out perfectly fine until 2016 when scientists noticed the glue! Let's discover this and other weird facts National Geographic shared with us. Learn more about your ad choices. Visit megaphone.fm/adchoices