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Here's a selection of Science desk reporters' most memorable stories of the year, with a focus on archaeology, biology and space.

By THE NEW YORK TIMES

Apparently not. A Times science writer learns how to tell the difference between a Finn-Dorset and a Lleyn.

By JOANNA KLEIN

Scientists have answered a longstanding question about whether cloned animals age prematurely.

By JOANNA KLEIN

The companies behind it, Boyalife Group and Soaam Biotech, must contend with consumers in a country where food safety is a near obsession.

By OWEN GUO

The retraction by Science of a study of changing attitudes on gay marriage is the latest in a growing number of prominent withdrawals of the results of studies from scientific literature.

By MICHAEL ROSTON

Scientists have moved a step closer to the goal of creating stem cells perfectly matched to a patients DNA in order to treat diseases, they announced on Thursday, creating patient-specific cell lines out of the skin cells of two adult men.

Nearly a decade after his downfall for faking research, the South Korean scientist Hwang Woo-suk has won patents for his work in an attempt to resume studying human stem cells.

Bringing extinct animals back to life is really happening and its going to be very, very cool. Unless it ends up being very, very bad.

By NATHANIEL RICH

Dr. Hwang Woo-suk of South Korea received the patent for the method by which he claimed in 2004 to have extracted stem cells from cloned human embryos.

In 1997, Scottish scientists revealed they had cloned a sheep and named her Dolly, sending waves of future shock around the world that continue to shape frontiers of science today.

Retro Report

The uproar over Dolly the sheep and human embryonic stem cells, revisited in a Retro Report video, shows how emotions can cloud understanding of science.

By NICHOLAS WADE

Researchers fused skin cells with donated human eggs to create human embryos that were genetically identical to the person who provided the skin cells.

By ANDREW POLLACK

It could be years before scientists succeed in bringing species back from extinction, but they are thinking of ways to give new life to creatures like woolly mammoths and weird frogs.

By GINA KOLATA

Dr. Campbell, a British cell biologist, helped create Dolly, the first mammal to be cloned from an adult animal.

Shinya Yamanaka and John B. Gurdon, the two scientists who were awarded the Nobel Prize in Physiology or Medicine on Monday, helped lay the foundation for regenerative medicine.

I Cloned My Pet 2 is about three dog owners contemplating the costly procedure to genetically recreate their beloved dead pets.

Surprisingly, it's possible to take ''I Cloned My Pet 2'' seriously for almost its entire length. Right up until the moment when one pet owner consults a medium to find out her dead dog's opinion on whether she should clone him. The show, Monday on TLC, is a follow-up to an installment broadcast in January. Three cases occupy the hour: a Florida couple, Edgar and Nina Otto, who had their Labrador retriever cloned; a Beverly Hills cosmetic surgeon, Dr. George Semel, who wants his Chihuahua back; and a Los Angeles woman named Myra who was so fond of a basenji named Kabuki that she saved his blankets and such in hermetically sealed bags.

Amy Finkel lives in an apartment in Boerum Hill, Brooklyn, that does not allow pets. But she does have a groundhog (Chompers), an armadillo (Fleischesser) and a boar (Angel). They are all, however, dead and stuffed - and in the case of the boar, it is just the head.

A plan hatched by tree enthusiasts hopes to clone and mass-produce colossal redwoods, the tallest living things on earth.

Here's a selection of Science desk reporters' most memorable stories of the year, with a focus on archaeology, biology and space.

By THE NEW YORK TIMES

Apparently not. A Times science writer learns how to tell the difference between a Finn-Dorset and a Lleyn.

By JOANNA KLEIN

Scientists have answered a longstanding question about whether cloned animals age prematurely.

By JOANNA KLEIN

The companies behind it, Boyalife Group and Soaam Biotech, must contend with consumers in a country where food safety is a near obsession.

By OWEN GUO

The retraction by Science of a study of changing attitudes on gay marriage is the latest in a growing number of prominent withdrawals of the results of studies from scientific literature.

By MICHAEL ROSTON

Scientists have moved a step closer to the goal of creating stem cells perfectly matched to a patients DNA in order to treat diseases, they announced on Thursday, creating patient-specific cell lines out of the skin cells of two adult men.

Nearly a decade after his downfall for faking research, the South Korean scientist Hwang Woo-suk has won patents for his work in an attempt to resume studying human stem cells.

Bringing extinct animals back to life is really happening and its going to be very, very cool. Unless it ends up being very, very bad.

By NATHANIEL RICH

Dr. Hwang Woo-suk of South Korea received the patent for the method by which he claimed in 2004 to have extracted stem cells from cloned human embryos.

In 1997, Scottish scientists revealed they had cloned a sheep and named her Dolly, sending waves of future shock around the world that continue to shape frontiers of science today.

Retro Report

The uproar over Dolly the sheep and human embryonic stem cells, revisited in a Retro Report video, shows how emotions can cloud understanding of science.

By NICHOLAS WADE

Researchers fused skin cells with donated human eggs to create human embryos that were genetically identical to the person who provided the skin cells.

By ANDREW POLLACK

It could be years before scientists succeed in bringing species back from extinction, but they are thinking of ways to give new life to creatures like woolly mammoths and weird frogs.

By GINA KOLATA

Dr. Campbell, a British cell biologist, helped create Dolly, the first mammal to be cloned from an adult animal.

Shinya Yamanaka and John B. Gurdon, the two scientists who were awarded the Nobel Prize in Physiology or Medicine on Monday, helped lay the foundation for regenerative medicine.

I Cloned My Pet 2 is about three dog owners contemplating the costly procedure to genetically recreate their beloved dead pets.

Surprisingly, it's possible to take ''I Cloned My Pet 2'' seriously for almost its entire length. Right up until the moment when one pet owner consults a medium to find out her dead dog's opinion on whether she should clone him. The show, Monday on TLC, is a follow-up to an installment broadcast in January. Three cases occupy the hour: a Florida couple, Edgar and Nina Otto, who had their Labrador retriever cloned; a Beverly Hills cosmetic surgeon, Dr. George Semel, who wants his Chihuahua back; and a Los Angeles woman named Myra who was so fond of a basenji named Kabuki that she saved his blankets and such in hermetically sealed bags.

Amy Finkel lives in an apartment in Boerum Hill, Brooklyn, that does not allow pets. But she does have a groundhog (Chompers), an armadillo (Fleischesser) and a boar (Angel). They are all, however, dead and stuffed - and in the case of the boar, it is just the head.

A plan hatched by tree enthusiasts hopes to clone and mass-produce colossal redwoods, the tallest living things on earth.

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Cloning - The New York Times