an epoch of scientific discoveries
121Marxism (Philosophies of) — Philosophies of Marxism Lenin, Lukács, Gramsci, Althusser Michael Kelly INTRODUCTION Marxist philosophy can be seen as a struggle with Hegel or a struggle with capitalism, that is, as an intellectual or a political movement. Neither of these… …
122Atomic clock — Nuclear clock redirects here. For the clock as a measure for risk of catastrophic destruction, see Doomsday Clock. For a clock updated by radio signals (commonly but inaccurately called an atomic clock ), see Radio clock. For the album by Zion I …
123Galaxy — This article is about the astronomical structure. For other uses, see Galaxy (disambiguation). NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 55,000 light years in diameter and approximately 60 million light… …
124Mercury (planet) — Mercury  ☿ …
125motion picture, history of the — Introduction history of the medium from the 19th century to the present. Early years, 1830–1910 Origins The illusion of motion pictures is based on the optical phenomena known as persistence of vision and the phi phenomenon. The first …
126Early Roman Christian Cemeteries — Early Roman Christian Cemeteries † Catholic Encyclopedia ► Early Roman Christian Cemeteries This article treats briefly of the individual catacomb cemeteries in the vicinity of Rome. For general information on the Roman catacombs, see …
127National Medal of Science — Awarded for Outstanding contributions in Physics, Biology, Mathematics, Engineering, or Social and Behavioral sciences Presented by President of the United States …
128Cetacea — Cetaceans[1] Temporal range: 55–0 Ma …
