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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The logo on his 2011 book, The Lean Startup (Crown Business), is an image of the ancient ouroboros, the snake eating its tail. This image implies a circuitous evolution that is never-ending, one that requires a deliberate self-consumption.