method of mirror reflections
61Bertrand Russell — Infobox Philosopher region = Western Philosophy era = 20th century philosophy color = #B0C4DE image caption = Russell in 1907 image size = 150px name = Bertrand Arthur William Russell, 3rd Earl Russell birth = birth date|df=yes|1872|5|18 Trellech …
62Radar — For other uses, see Radar (disambiguation). A long range radar antenna, known as ALTAIR, used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on Kwajalein Atoll …
63Magic square — In recreational mathematics, a magic square of order n is an arrangement of n2 numbers, usually distinct integers, in a square, such that the n numbers in all rows, all columns, and both diagonals sum to the same constant.[1] A normal magic… …
64Frankfurt School — This article is about the philosophical school. For the business school, see Frankfurt School of Finance Management. Part of a series on the …
65Eyepiece — For the device for looking through a camera, see viewfinder. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is… …
66Structured Light 3D Scanner — Principle Projecting a narrow band of light onto a three dimensionally shaped surface produces a line of illumination that appears distorted from other perspectives than that of the projector, and can be used for an exact geometric reconstruction …
67astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …
68Phenomenology (The beginnings of) — The beginnings of phenomenology Husserl and his predecessors Richard Cobb Stevens Edmund Husserl was the founder of phenomenology, one of the principal movements of twentieth century philosophy. His principal contribution to philosophy was his… …
69History of mathematics — A proof from Euclid s Elements, widely considered the most influential textbook of all time.[1] …
70Consciousness — Representation of consciousness from the seventeenth century. Consciousness is a term that refers to the relati …
