Simone Giertz, a 27-year-old YouTube star known for her wacky mechanical inventions, has undergone brain surgery. She went in for the procedure with the same humorous tone she's known for in her videos. Giertz announced a month ago that she had a brain tumor on her YouTube channel. A post to her Twitter account revealed Giertz seems to be doing OK following the surgery. InsideEdition.com's Keleigh Nealon (http://twitter.com/KeleighNealon) has more.