Extras

Video thumbnail: NOVA Killer Volcanoes Preview

NOVA

Killer Volcanoes Preview

Scientists hunt for a mega-eruption that plunged medieval Earth into a deep freeze.

Killer Volcanoes Preview

Video thumbnail: NOVA Ancient Volcanic Activity in Ice

NOVA

Ancient Volcanic Activity in Ice

Researchers try to prove the existence of a 13th century volcanic eruption using ice.

Ancient Volcanic Activity in Ice