Key Han has done it - no more dams, no polluting smoke – just 30 years of sweat and genius to produce this revolutionary, vital energy solution. By inventing submerged turbines that churn unseen on river and ocean beds, Key Han has created a cheap, continuous, clean energy source that when adopted will save our planet and meet our exploding energy needs.  Host Bart Jackson invites Differential Dynamics CEO Key Han to answer all the questions about his hydrokinetic river turbines:  How much energy? What cost?