Put simply, they began taking a waste product from one industry (coffee grounds) and redirecting it from landfill to make a sustainable business growing mushrooms. Once things got rolling for them more elegant opportunities presented themselves and now they're doing amazingly well.
They speak very passionately about this project of theirs too and I definitely get that "why didn't I think of that!" feeling, it's such a simple and complete idea. When I need a kick to get me moving again, I watch this. I hope you enjoy it.