https://www.ecnmag.com/news/2018/11/future-flight-now

"I've been working on this for 18 years," said Krauss, 55, of
Oberlin. "When I was a kid, I'd order plans for hang-gliders and hovercraft from
Popular Science magazine; I would build them. I started to design my own
vehicles from there. I built solar-powered vehicles when I was in my 20s."