Extras

Video thumbnail: NOVA DNA-Testing Reef Diversity

NOVA

DNA-Testing Reef Diversity

Marine biologist Laetitia Plaisance investigates species diversity in two coral reefs.

DNA-Testing Reef Diversity

Video thumbnail: NOVA Sea Butterflies in Danger

NOVA

Sea Butterflies in Danger

Pteropod populations could decline or vanish due to rising ocean acidity.

Sea Butterflies in Danger

Video thumbnail: NOVA Lethal Seas Preview

NOVA

Lethal Seas Preview

A unique coral reef in Papua New Guinea shows what the future may hold as oceans acidify.

Lethal Seas Preview