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WHOA!
At 4:20 he says, "20 meters about the surface we have to lower the rover on a tether that's 21 feet long." Ummm... remember the last time NASA mixed up metric and English units? That probe never slowed down and smashed into Mars. Suddenly, I'm very nervous for this mission. ("Why isn't the tether long enough? We made it 21 feet long and the skycrane is only 20 meters from the surface!")