It's difficult to build a working four-rotor helicopter that spans 100 feet and only weighs 80 pounds. It's even harder when your engine is a 0.7-horsepower person. But two teams of young engineers hope to do just that.
A meteorite from Mars hit the Moroccan desert in 2011. Now its otherworldly fragments are telling scientists about the history of the red planet. You, too, can own a piece of Martian history — if you've got a couple hundred thousand dollars to spare.
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