As we mentioned last time, one of the attractions at Prius Connection New York was a "20 Questions" tree to see how much we really knew about the new 2010 Toyota Prius.

It didn't get much traffic, sitting back there in a corner. Not surprisingly, the brand new, metallic blue, top-spec Prius next to it stole all the attention. (The solar moonroof was a particular hit among the fans.) But we were intrigued by the idea of testing our knowledge, so after a cocktail, we started flipping through the questions hanging off its branches.

We're proud to say we nailed most of the questions--we do our best to keep up--including how a hybrid works, what chemistry the battery pack uses, and so forth. But one completely stumped us. It's a great question, so we wondered how many of you would know it.

What three industry firsts can be found in the 2010 Prius?

For the record, an "industry first" is a feature that has never before appeared in any production vehicle.

Now, because we're nice guys here, we'll offer a few clues. One of the features is to maximize fuel economy; another is only for the driver; and the last one can only be used outside the car.

You might well be able to answer this by some assiduous web searching. And frankly, we don't have any prizes to offer other than glory. But that said, enter your answers in the comments and we'll let you know as soon as someone has all three right. Go!