two by two
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Two and a Half Men — Genre Sitcom Created by Chuck Lorre Lee Aronsohn … Wikipedia
Two-wheel tractor — in Italy (2008) Two wheel tractor or walking tractor are generic terms understood in the USA and in parts of Europe to represent a single axle tractor, which is a tractor with one axle, self powered and self propelled, which can pull and power… … Wikipedia
Two-factor authentication — (TFA, T FA or 2FA) is an approach to authentication which requires the presentation of two different kinds of evidence that someone is who they say they are. It is a part of the broader family of multi factor authentication, which is a defense in … Wikipedia
Two — (t[=oo]), a. [OE. two, twa, properly fem. & neut., twei, twein, tweien, properly masc. (whence E. twain), AS. tw[=a], fem. & neut., tw[=e]gen, masc., t[=u], neut.; akin to OFries. tw[=e]ne, masc., tw[=a], fem. & neut., OS. tw[=e]ne, masc., tw[=a] … The Collaborative International Dictionary of English
Two-photon excitation microscopy — is a fluorescence imaging technique that allows imaging of living tissue up to a very high depth, that is up to about one millimeter. Being a special variant of the multiphoton fluorescence microscope, it uses red shifted excitation light which… … Wikipedia
Two-body problem — Two bodies with similar mass orbiting around a common barycenter with elliptic orbits. In classical mechanics, the two body problem is to determine the motion of two point particles that interact only with each other. Common examples include a… … Wikipedia
Two-Gun Kid — (Matt Hawk / Matt Liebowicz) Art by Scott Kolins. Publication information Publisher Marvel Comics … Wikipedia
Two-toed sloth — Two toed sloths[1] Temporal range: 35–0 Ma … Wikipedia
Two-photon absorption — (TPA) is the simultaneous absorption of two photons of identical or different frequencies in order to excite a molecule from one state (usually the ground state) to a higher energy electronic state. The energy difference between the involved… … Wikipedia
Two-sided market — Two sided markets, also called two sided networks, are economic networks having two distinct user groups that provide each other with network benefits. Example markets include credit cards, comprised of cardholders and merchants; HMOs (patients… … Wikipedia
Two-phase electric power — Two phase electrical power was an early 20th century polyphase alternating current electric power distribution system. Two circuits were used, with voltage phases differing by 90 degrees. Usually circuits used four wires, two for each phase. Less … Wikipedia
