TOM: My answer was a helium balloon.

RAY: There you go. You're right. That's the answer. Any balloon with lighter-than-air gas, such as helium or hydrogen, would work for an answer. Because on the Earth it wouldn't weigh anything on the scale, right?

TOM: Right.

RAY: In fact if you were standing on the scale and holding a big enough helium balloon --

TOM: It could make you weigh less.

RAY: It could make you weight nothing. If you tried to put it on the scale it wouldn't register because it would float away. But on the moon, because there is no atmosphere, in addition to being not much gravity, there's nothing for the balloon to float on. Therefore, if it doesn't explode, it'll sit on the scale and it'll actually weigh something, whereas on the earth it doesn't weigh anything.

So do we have a winner?

TOM: Yeah, we do have a winner. The winner is Rochan Sharusta, from Kathmandu, Nepal.

RAY: No kidding.

TOM: Get out. Rochan-- we don't know if it's a male or a female-- for having your e-mailed answer selected at random from among all the correct answers that we got, you're going to get a $26 gift certificate to our Shameless Commerce Division, which is at the Car Talk section of Cars.com. And with that 26 bucks you can pick up a copy of our music CD called "Car Talk Car Tunes, Volume 1, the Car Talk Compendium of Disrespectful Car Songs," which we understand is currently number one on the Sherpa Bandstand.

[ Car Talk Puzzler ]