People tend to get hung up on a small detail of this seriously cool mission. Here's the catch: it's a one way trip.
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If you shop or make your bank transactions online, use your GPS to find where you are going, check the weather on your cell phone, then you are using these satellites.
When clouds pass through, climbers have to stop and wait until they can see where to put their feet. Climbers unrope for this most dangerous part because the slopes are so sheer, a slip would be a free fall.
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