These experiments show how a tornado vortex is generated. Steve Spangler is a celebrity teacher, science-toy designer, speaker, author and an Emmy award-winning television personality. Spangler is probably best known for his Mentos and Diet Coke geyser experiment that went viral in 2005 and prompted more than 1,000 related YouTube videos. In this clip, Spangler demonstrates a 'safe for kids' vortex using water and soda bottles, followed by a more scientifically accurate, adults-only version using fire and a lazy susan.