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%.
Lean startup is an approach to business development that is based on the principles of lean production, a manufacturing methodology that values a business' ability to change quickly. Download 9 FREE Strategic Planning Templates that your Peers Already Use.
Lean(verb) of a character which prevents the compositor from earning the usual wages; -- opposed to fat; as, lean copy, matter, or type. Lean(noun) that part of flesh which consist principally of muscle without the fat. Lean(noun) unremunerative copy or work.