k.r. sridhar has been hyper secretive-- no signs on his building, a cryptic website, and no public progresseports. given the stealthiness, we were surprised when k.r. showed us for the very first time how he makes the secret sauce of his fuel cell on the cheap. actually, i feel like i'm on a cooking show. you're martha stewart. >> absolutely. so let's take that cooking analogy. >> okay. >> start with the flour. >> the flour. >> okay? >> what is that? >> that is beach sand. >> it's beach sand? >> ocean beaches in multiple continents has this material in abundance. >> he said he bakes the sand and cuts it into little squares. okay, so this is beach sand turned magically into a ceramic. >> yeah, into a ceramic. >> and then he coats it with green and black inks that he developed. okay, is it a secret formula? >> there is a secret formula. >> okay. >> and you take that... >> mm-hmm. >> and you apply that, you paint that, on either side of this white ceramic to get a green layer and a black layer. >> and that's it? >> that's it. >> that's the secret. >> so what i'm holding in my hand is a fuel ce