Tilmann Heinig may be 51 years old, but he's Germany's fastest speed kiter. Now he hopes to break the world speed record of 105.32 kilometers an hour on the stormy North Sea.
In 60 years of space exploration, we've placed almost 7,000 satellites in orbit. Less than a third still function. The rest is dangerous junk - and their number is growing. Here's how we might mitigate the threat.
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