gravity preparation
21Christianity — /kris chee an i tee/, n., pl. Christianities. 1. the Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches. 2. Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; …
22Moon landing — For other uses, see Moon landing (disambiguation). Still frame from the video transmission of Neil Armstrong stepping onto the surface of the Moon at 02:56 UTC on 21 July 1969. An estimated 500 million people worldwide watched this event,… …
23Mir — This article is about the Soviet/Russian space station. For other uses, see Mir (disambiguation). Mir …
24Writing of Principia Mathematica — Isaac Newton composed Principia Mathematica during 1685 and 1686.Authoring Principia Newton s major work mdash; Principia Mathematica In the other letters written in 1685 and 1686, he asks Flamsteed for information about the orbits of the moons… …
25harbours and sea works — Introduction harbour also spelled harbor any part of a body of water and the manmade structures surrounding it that sufficiently shelters a vessel from wind, waves, and currents, enabling safe anchorage or the discharge and loading of… …
26Colloid — Milk is an emulsified colloid of liquid butterfat globules dispersed within a water based solution. A colloid is a substance microscopically dispersed evenly throughout another substance.[1] A colloidal system consists of two separate phases: a… …
27theatre — /thee euh teuhr, theeeu /, n. theater. * * * I Building or space in which performances are given before an audience. It contains an auditorium and stage. In ancient Greece, where Western theatre began (5th century BC), theatres were constructed… …
28concentration — 1. A preparation made by extracting a crude drug, precipitating from the solution, and drying. 2. Increasing the amount of solute in a given volume of solution by evaporation of the solvent. 3. The quantity of a substance per unit …
29Alum — This article is about the chemical compound. For other uses, see Alum (disambiguation). Bulk alum Alum (  / …
30Coffee — This article is about the beverage. For the bean it is made from, see Coffee bean. For other uses, see Coffee (disambiguation). Coffee A cup of black coffee Type Hot Country of origin …
