a sail for paddleboats and an electric surfboard. At this year's CES, I spoke with Chen's daughter Ywanne about his latest rideable invention, which is for obvious reasons called the Solowheel. Her father's the one you can see demonstrating the device in the background; you can see trickier riding in this YouTube video. She says that of all her father's inventions, this is the one that came together most easily: his first stab at a powered unicycle just worked, and since then it's been polishing the experience and getting it to market. And "to market" isn't a dream; for about $1800, you can have an experience that's a bit more intense than a Segway. The Solowheel can climb hills of surprising steepness, as long as the rider is up for it. Coming down looks more challenging, though.