4-D ultrasound images show remarkable behavior of a lion embryo and a cat embryo running in place and stretching in the womb.

The latest installment of National Geographics popular franchise In the Womb follows the embryonic and fetal journey of one of natures most fascinating reproductive miracles identical twins. Witness the key moments during early embryogenesis from the spontaneous splitting of a single fertilized egg into identical twins through to the major milestones of twin fetal development, ending with their dramatic births. Along the way, learn how skin color is formed; what happens when aberrations in early development occur, producing conjoined twins; and how twins with ambiguous genitalia (hermaphrodites) can develop. Meet a pair of identicals who were separated at birth and met for the first time four decades later. Then, see dramatic 4-D ultrasound images of twins interacting in the womb in real time.

From the moment of conception, every human embryo embarks on an incredible nine month journey of development. Now, cutting-edge technology makes it possible for National Geographics In the Womb to open a window into the hidden world of the fetus and explore each trimester in amazing new detail. Revolutionary imagery sheds light on the delicate, dark world of a fetus as never before.

This film will follow the most intimate details on how will develop three different mammals, ranging from a single evolutionary ancestor and turning into a completely different adult animals: the dolphin - a highly developed mammals, whose ancestors have ever lived on land, domestic dog - one of the greatest achievements of evolution, which has more than 400 different species and the approximate population of the earth about 100 million and an elephant - the largest land animal with the largest among mammals during pregnancy.

This film will follow the most intimate details on how will develop three different mammals, ranging from a single evolutionary ancestor and turning into a completely different adult animals: the dolphin - a highly developed mammals, whose ancestors have ever lived on land, domestic dog - one of the greatest achievements of evolution, which has more than 400 different species and the approximate population of the earth about 100 million and an elephant - the largest land animal with the largest among mammals during pregnancy.

Dramatic 4-D images trace the embryonic and fetal journey of one of nature's most fascinating miracles.

Having already foreseen World War I and the 2006 Asian tsunami, should we take seriously the Mayan prophecies that the world will end in 2012? What if the Maya were right about the end of humanity as we know it? Would fire pour from the sky, buildings shatter, floods destroy Washington DC and Los Angeles slide into the Pacific? That’s how Hollywood has interpreted the end of the Maya great calendar cycle on December 21, 2012, in the movie “2012” with John Cusack.

In May 2007, a nearly perfectly preserved baby woolly mammoth appears on the shore of a remote Siberian river. 10,000 years after her species became extinct she is in amazing condition and unlike any other animal ever dug out of the frozen earth. Her name is Lyuba. She was one month old. And now, thanks to breakthrough science, she will yield the details of her life and be preserved for the ages.

Meet the engineers who put this telescope in space, the astronauts who fixed its eyesight and the astronomers who use Hubble's unrivalled spatial resolution to stargaze.

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Frogs live on this planet more than''360 million years,''and for centuries, became one of the most wonderful and diverse creatures on earth. Today, however, is their remarkable adaptations and survival tactics are not justified. Indeed, it is a sad state of affairs for the frogs. We've probably lost a third of amphibians, and many others are in serious jeopardy.

Frogs live on this planet more than''360 million years,''and for centuries, became one of the most wonderful and diverse creatures on earth. Today, however, is their remarkable adaptations and survival tactics are not justified. Indeed, it is a sad state of affairs for the frogs. We've probably lost a third of amphibians, and many others are in serious jeopardy.

Uncover the secrets behind the magnificent Parthenon, in an inside look at its $10 billion restoration. It was first used as a temple to Athena.