Extras

    Video thumbnail: NOVA Bomb Squad Robots

    NOVA

    Bomb Squad Robots

    Remote controlled robots keep police department technicians safe from potential bombs.

    Bomb Squad Robots

    Video thumbnail: NOVA Manhunt—Boston Bombers Preview

    NOVA

    Manhunt—Boston Bombers Preview

    Follow the manhunt, step-by-step, for the suspects in the Boston Marathon bombings.

    Manhunt—Boston Bombers Preview