Check this out - Steven Tyler will be on the Today show Friday, October 19th at 7:30am ET promoting his segment on National Georgraphic's "Incredible Human Machine." Be sure to tune in Friday the 19th at 7:30am to the Today show and catch Steven with Dr. Zeitels.  And remember the Incredible Human Machine airs Sunday, October 21st at 9pm ET/8pm CT.  Don't miss it!!!