HDMI cable is just a high density new connector for both video and audio that maintains the 1080 quality. I think the acronym is High Density Multimedia Interface.
Planet Earth is 6 CDs, with 3 episodes per CD, from what I can tell so far. Each episode is about 48 minutes, plus another 10-12 of the diary for that episode on how it was made. It was $51 at Costco.
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