to time one's exposure correctly -
81Doctor (Doctor Who) — This article is about the character of the Doctor. For a more general overview of the series, see Doctor Who. For the current Doctor, see Eleventh Doctor. Doctor Who character …
82Science of photography — refers to the use of science, such as chemistry and physics, in all aspects of photography. This applies to the camera, its lenses, physical operation of the camera, electronic camera internals, and the process of developing film in order to take …
83Royal Observer Corps — Ensign Active 1925–1996 Country …
84disease — diseasedly, adv. diseasedness, n. /di zeez /, n., v., diseased, diseasing. n. 1. a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection,… …
85Learning to read — Part of a series on Reading …
86Marine mammals and sonar — A Humpback whale Active sonar, the transmission equipment used on some ships to assist with navigation, has been suggested[1] to be detrimental to the health and livelihood of some marine animals, although the precise mechanisms for this are not… …
87Beryllium — (pronEng|bəˈrɪliəm) is a chemical element with the symbol Be and atomic number 4. A bivalent element, beryllium is a steel grey, strong, light weight yet brittle alkaline earth metal. It is primarily used as a hardening agent in alloys, most… …
88Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …
89optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …
90Survivor: Gabon — Earth s Last Eden Genre Reality television Winner Robert Bob Crowley (4–3–0) No. of episodes 14 No. of d …
