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Last year, researchers at University College London's Institute of Healthy Ageing were looking through their microscopes when they saw something amazing.

David Gems, professor of biogerentology, was part of the team looking for answers to big questions about human aging in small, squishy little creatures nearing the end of their lives. Their official name: Caenorhabditis elegans. You and I know them as worms.

DAVID GEMS: As the worms approach death, they become slower and slower, and they stop moving. And then suddenly, there appears a sort of ghostly blue fluorescence. And then it spreads in a kind of flashing wave from the front end to the back end. It's really quite a sort of eerie phenomenon because it's kind of reminiscent of the soul departing the body of the worm. Well, of course, that's not what it really is.

LYDEN: Now whether or not we want to talk about worms having a soul, what this really is is a blue fluorescent dye that grows brighter and brighter as the worms expire. Scientists had seen that before. But with the help of a time-lapse camera, Gems and his colleagues had front-row seats to a new, more morbid show: death.

GEMS: We've been studying the biology of death in this creature. You can actually see it passing through the organism.

LYDEN: Cell by cell, over the course of a few hours - or a few minutes, if the worm is under great duress - the chemical cascade of death advances. But, says Gems, interfering with that process by altering genes has some pretty dramatic consequences.

GEMS: Because we can see death, it's meant that we've been able to find ways of stopping death. And in some circumstances, if you do that, it actually extends the life of the worm a little bit. If we can just figure out aging in one animal, you know, we've got our foot in the door to a broader understanding of aging.

LYDEN: And that broader understanding could extend to our own species.

GEMS: If it's possible in animals, it should be possible in human beings. In principle, you might be able to work out ways, for example, of where you have damaged tissue, from infection or injury or from stroke, of stopping the death from spreading from the dead part to the live part. And in the end, if we can slow aging down, then we can protect against the whole spectrum of aging-related diseases.

LYDEN: An exciting prospect for the future of medicine. But doesn't the study of all this death and dying get a bit, well, depressing? We put the question to Professor Gems.

GEMS: The thing which is depressing is when you're faced with something which is completely undefeatable. But when you work on aging - when you work on the biology of aging, and you realize that aging is actually something that's plastic, it's something that's changeable, then you're in the position of confronting really a terrible evil and being - and having a chance of being able to do something about it. I mean, that's quite the opposite of depressing. It's a very exciting challenge.

LYDEN: David Gems is a professor at the Institute for Healthy Aging in London.

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