Perlan II: A glider that aims to go to 90,000ft(nytimes.com)
nytimes.com
Perlan II: A glider that aims to go to 90,000ft
http://www.nytimes.com/2013/10/22/science/quiet-trip-to-the-ozone-hole.html?_r=2&
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http://www.nytimes.com/2013/10/22/science/quiet-trip-to-the-ozone-hole.html?_r=2&
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