概述
Imagine you're Alan Eustace. You're in your 50's, you've got two young daughters and a loving wife at home and you're the Senior Vice-President of 'Knowledge' at Google. But none of that matters to you right now -- because in less than a minute the giant balloon strapped to your back is going to inflate to the size of a football stadium as it carries you over 135,000 feet strai...
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