In simple words, an Oxygen Concentrator works on electricity; takes in room air, removes Nitrogen from it and provides upto 95% pure Oxygen. The composition of air (78% Nitrogen, 21% Oxygen and 1% other gases like Carbon Dioxide, Argon, etc.) clearly shows that air is mainly comprised of two gases: Nitrogen and Oxygen [together 99%].
Word Origin and History for savoir-faire Expand. n. instinctive knowledge of the right course of action in any circumstance, 1815, from French, literally to know (how) to do, from savoir to know (from Latin sapere; see sapient) + faire (from Latin facere; see factitious).
About Vevo. Vevo is a video hosting service owned and operated by a joint venture of Universal Music Group (UMG), Google, Sony Music Entertainment (SME) and Abu Dhabi Media. It launched on December 8, 2009. The videos on Vevo are syndicated across the web,with Google and Vevo sharing the advertising revenue. Vevo is currently available in Australia, Brazil, Canada, France, Germany, Ireland, Italy, Mexico, The Netherlands, New Zealand, Poland, Spain, the United Kingdom, and the United States.