The experiment was repeated with three other juvenile lemon sharks and two other juvenile nurse sharks (Ginglymostoma cirratum), and care was taken to eliminate all stray metal objects in the testing site. Patrick Rice, Michael Herrmann, and Eric Stroud were present at this first trial. Mike Rowe, from Discovery Channel’s Dirty Jobs series, subsequently witnessed and participated in a test using an electropositive metal within 24 hours after the discovery.[1]