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In the same year, Chegg also acquired Cramster, a provider of online homework help, [28] and Notehall, an online marketplace for class notes. [29] In 2011, Chegg acquired Zinch, a scholarship search and networking service for high school students and college recruiters, and continues to offer the service, under the Chegg brand name. [30]
Naismith's rule is a rule of thumb that helps in the planning of a walking or hiking expedition by calculating how long it will take to walk the route, including ascents. Navier–Stokes equations: In physics, these equations describe the motion of viscous fluid substances. Named after Claude-Louis Navier and George Gabriel Stokes.
The story is told in many variants, [9] including a joke about a physicist who said he could predict the winner of any race provided it involved spherical horses moving through a vacuum. [ 10 ] [ 11 ] A 1973 letter to the editor in the journal Science describes the "famous story" about a physicist whose solution to a poultry farm's egg ...
A reviewer of Publishers Weekly stated: "In confident and verbose prose, Krauss tells a story that both celebrates and explores science. Through it, he reminds readers why scientists build such complicated machinery and push the boundaries of the quantum world when nothing makes sense: “For no more practical reason than to celebrate and explore the beauty of nature."
An animation of the figure-8 solution to the three-body problem over a single period T ≃ 6.3259 [13] 20 examples of periodic solutions to the three-body problem. In the 1970s, Michel Hénon and Roger A. Broucke each found a set of solutions that form part of the same family of solutions: the Broucke–Hénon–Hadjidemetriou family. In this ...
Judge Story famously commented that, Patents and copyrights approach, nearer than any other class of cases belonging to forensic discussions, to what may be called the metaphysics of law, where the distinctions are, or at least may be, very subtile and refined, and, sometimes, almost evanescent.
Adams interpreted history as a process moving towards "equilibrium", but he saw militaristic nations (he felt Germany pre-eminent in this class) as tending to reverse this process, a Maxwell's demon of history. Adams made many attempts to respond to the criticism of his formulation from his scientific colleagues, but the work remained ...
The Feynman Lectures on Physics is a physics textbook based on a great number of lectures by Richard Feynman, a Nobel laureate who has sometimes been called "The Great Explainer". [1] The lectures were presented before undergraduate students at the California Institute of Technology (Caltech), during 1961–1964.