the two curves
71spine, curvature of the — ▪ pathology any of a group of deviations of the normal spinal curvature, including scoliosis, lordosis, and kyphosis. Scoliosis is a lateral, or sideways, deviation of the spine, or vertebral column. The condition usually includes two …
72History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
73High-speed rail in the United Kingdom — The United Kingdom has four classic main railway lines operating at convert|125|mph|km/h|sigfig=2, plus convert|108|km|mi|sigfig=1 of High Speed 1 high speed line.The fastest current UK domestic services operate at convert|125|mph|km/h|sigfig=2… …
74History of the MBTA — The history of the Massachusetts Bay Transportation Authority spans two centuries, starting with one of the oldest railroads in the country.Mass transit in Boston was provided by private companies, often granted charters by the state legislature… …
75Development of the TGV — The idea of a high speed train in France was born about twenty years before the first TGVs entered service. At that time, about 1960, a radical new concept was thought up; combining very high speeds and steep grades would allow a railway to… …
76Course of the Klamath River — The Klamath River is a river in southern Oregon and northern California in the United States. This article describes its course. Contents 1 Oregon 2 Far northern California 3 Weitchpec to mouth …
77Doorways in the Sand —   …
78Differential geometry of curves — This article considers only curves in Euclidean space. Most of the notions presented here have analogues for curves in Riemannian and pseudo Riemannian manifolds. For a discussion of curves in an arbitrary topological space, see the main article… …
79On the Floor — Single by Jennifer Lopez featuring Pitbull …
80Counting points on elliptic curves — An important aspect in the study of elliptic curves is devising effective ways of counting points on the curve. There have been several approaches to do so, and the algorithms devised have proved to be useful tools in the study of various fields… …
