Extras

    Video thumbnail: NOVA The Hidden Fluorescent World

    NOVA

    The Hidden Fluorescent World

    The proteins that make fish fluoresce could help scientists map the human brain.

    The Hidden Fluorescent World

    Video thumbnail: NOVA Creatures of Light Preview

    NOVA

    Creatures of Light Preview

    Deep in the ocean, animals that flash, sparkle, and glow use light to survive in the dark.

    Creatures of Light Preview