NOVA

Easter Island has mystified the world ever since the first Europeans arrived in 1722.

The Vikings were the most ferocious warriors of the Middle Ages. Especially fearsome were the select few who wielded a formidable weapon: a light, razor sharp, virtually indestructible sword with its maker's name, ULFBERHT, inlaid along the blade.

With the help of new spacecraft and Earth-based telescopes, scientists are seeing the Sun as they never have before and even re-creating what happens at the very center of the Sun.

Witness the extraordinary surgery that will allow twin girls, born joined at the head, to live separate lives.

Racing against developers in the Rockies, archaeologists uncover a unique site packed with astonishingly preserved bones of mammoths, mastodons and other giant extinct beasts, opening a window on the vanished world of the Ice Age.

NOVA meets a new breed of experts who are approaching "cold case" art mysteries as if they were crime scenes, determined to discover "who committed the art," and follows art sleuths as they deploy new techniques to combat the multi-billion dollar criminal market in stolen and fraudulent art.