OK, so we've figured out how to propel a small device through space at 60,000 kilometres an hour for 10 years, and then land it on a comet 6 billion kilometers away.
But using a solar-powered car to drive, say, the 60 kilometres between Toronto and Whitby? No way. Get real.
For that matter, humans first operated a solar-powered car on the moon almost 40 years ago. But the trip to Whitby still seems too challenging.