And you know, they are really nice when they light up at night. "One couple we talked to was visiting from France.

VOA: special.2010.05.07

The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

We want you to know we have a green light to continue this series next week.

VOA: special.2010.05.23

In the dark centers of his eyes you can see the light from Arbus' camera.

VOA: special.2009.08.09

They appear red. Light waves from an object speeding toward you will have shorter wavelengths.

VOA: special.2009.04.29

Light waves from an object speeding away from you will stretch into longer wavelengths.

VOA: special.2009.04.29

By October,you may need to wear a light jacket, especially after sunset.

VOA: special.2009.09.21

"The eyes light up and click. It happens -- 'I didn't know you had this.'" Jenny Johnson is the executive director of marketing for the Online Computer Library Center.

VOA: special.2011.07.11

"I celebrate Hanukkah.Well, you have to light candles every night.

VOA: special.2009.12.21

"Now,if you're on a star about 1,000 light years away, you see earth as it was 1,000 years ago.

VOA: standard.2010.04.16

That golden light represents where she and everyone else moves on to, so the idea is you can put whatever you choose into that golden light.

VOA: standard.2010.01.08

It's like you're photographing the light as well as the Machu Picchu itself."

VOA: standard.2009.12.15

But the silicon is what converts light into electricity, so you might think using so much less silicon would reduce the electrical output, but Atwater says that's not the case.

VOA: standard.2010.02.19

"It's putting a false sense on the market right now that everybody has this big flashing yellow light flashing, caution,caution,caution, so people are buying stuff you know in high volume than they usually buy.

VOA: standard.2010.05.08