The general concepts found in this section are: 1  The earth's atmosphere is a very thin layer wrapped around a very large planet. 2  Two gases make up the bulk of the earth's atmosphere: nitrogen (), which comprises 78% of the atmosphere, and oxygen (), which accounts for 21%.
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It is sure to become a management classic.â âDon Reinertsen, author of The Principles of Product Development Flow. âThe Lean Startup is a foundational must-read for founders, enabling them to reduce product failures by bringing structure and science to what is usually informal and an art.