Incredibly ambitious project. I watched the whole documentary.

I'm surprised they were 'unable to secure additional funding'.

Considering how many crackpot app-of-the-month companies have gotten cash thrown at them over the last decade, you would think a company doing real engineering would be drowning in money. It's a bummer to hear that they folded.

Speculation abounds, I suppose, as to why investors started (or kept) saying "no."