That's something else! And yet I'm not surprised; all sorts of things turn out to have valuable niche uses despite being superseded in the mainstream. Now I'm

That's something else! And yet I'm not surprised; all sorts of things turn out to have valuable niche uses despite being superseded in the mainstream. Now I'm wondering if the future might hold robot-driven sailing ships (wind and solar are renewable, and ocean shipping isn't exactly about speed) -- and I'm certainly not betting on internal-combustion engines going away for good.