Pondering Two Inventions

RAY: What they're measuring is the passage of time. One is the sandglass, which has thousands of grains of sand. The other is the sundial, which has no moving parts.

Both of them measure the passage of time.

Do we have a winner?

TOM: The winner this week is Melissa Armstrong from Fleetwood, Pennsylvania. And for having her answer selected at random, from among all the correct answers that we got, Melissa is going to get a 26 dollar gift certificate to the Shameless Commerce Division at cartalk.com, with which she can pick up our brand-new, two-color Car Talk baseball jersey, which has three-quarter length sleeves. It's perfect for keeping those arms warm while you're wasting away on the bench!

[ Car Talk Puzzler ]