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DEBBY AREM: "I come up with ideas many times but I can't quite figure out how to engineer it. And Joel is a master at taking an idea that I come up with and figuring out how to actually put it together."

FAITH LAPIDUS: Debby and Joel Arem say working together for twenty years has strengthened their marriage.

JOEL AREM: "You get to know a person a lot better when you spend that much time and overcoming not only the challenges of the relationship but the stress of business really puts the strain on a relationship. If you can get through it, it [marriage] gets stronger."

DEBBY AREM: "We have a lot of fun, we really do. I don't consider this work. That's the best part of it."

Now, instead of traveling to craft shows, the Arems use the Internet to sell their artwork. That way they can spend more time in their home studio, meeting the increasing demand from around the world for the creations.

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JUNE SIMMS: Living things of all kinds have qualities that help them to survive. One example is the ability of some animals to create light to find food, or avoid being eaten or, in some cases, to identify a mate. A new exhibit in New York explores this ability, known as bioluminescence. The exhibit, called "Creatures of Light," can be seen at the American Museum of Natural History. It shows jellyfish that produce a greenish light or glow. It also includes anglerfish whose lantern-like lights hang from their foreheads.

Museum Provost Michael Novacek says he is interested in the bioluminescent creatures that live deep in the ocean.

MICHAEL NOVACEK: "They are probably the most inventive of the bioluminescent creatures because they have to be. Because it's totally dark. So that's probably where the greatest potential for discovery is, too. There are so many things down there we haven't even described."

FAITH LAPIDUS: Surprisingly, up to ninety percent of the areas where living things can survive is underwater. Most of the animals that live in the water below depths of seven hundred meters are bioluminescent. That is where the anglerfish and hatchetfish live.

John Sparks organized the exhibit. Mr. Sparks is a marine biologist who specializes in pony fish, which live closer to the surface. They can give off light during the daytime that appears similar to their surroundings. This makes them extremely difficult for other fish to see.

JUNE SIMMS: Many bioluminescent animals use light to trick other creatures. The glowing shape on the underbelly of the large cookie cutter shark, for example, looks like the sun or moonlight on the surface of the water. From below, other creatures can mistake the small dark areas between the shark's lights for small fish. When an attacking fish moves in for what it thinks will be a quick meal, it can become a meal for the shark instead.

The show also includes some of the many bioluminescent organisms that live on land. The "Creatures of Light" exhibit continues at the American Museum of Natural History in New York until early next year.

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FAITH LAPIDUS: Our program was produced by Mario Ritter, with reporting by Medeeha Anwar, Julie Taboh, June Soh and Adam Phillips. I'm Faith Lapidus.

JUNE SIMMS: And I'm June Simms. Join us again next week for THIS IS AMERICA in VOA Special English.

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