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61MUD — This article is about a type of online computer game. For other uses, see Mud (disambiguation) …
62Space elevator — A space elevator for Earth would consist of a cable anchored to the Earth s equator, reaching into space. By attaching a counterweight at the end (or by further extending the cable upward for the same purpose), the center of mass is kept well… …
63Tesla turbine — The Tesla turbine is a bladeless centrifugal flow turbine expander patented by Nikola Tesla in 1913. It is referred to as a bladeless turbine because it uses the boundary layer effect and not a fluid impinging upon the blades as in a conventional …
64Geography of Ethiopia — Map of Ethiopia. Satellite image of Ethiopi …
65Holography — (from the Greek, ὅλος hólos whole + γραφή grafē writing, drawing) is a technique that allows the light scattered from an object to be recorded and later reconstructed so that it appears as if the object is in the same position relative to the… …
66Oceanic trench — Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric scale long but narrow topographic depressions of the sea floor. They are also the… …
67History of the tank — This article is about the history of the tank.The prehistory of the tank [ thumb|right|Recreation of an armoured vehicle designed by Leonardo da Vinci at the Château d Amboise] The problem of advancing to attack while under fire is as old as… …
68HMS Hood (51) — HMS Hood (pennant number 51) was a battlecruiser of the Royal Navy, and considered the pride of the Royal Navy in the interwar period and during the early period of World War II. She was one of four Admiral class battlecruisers ordered in mid… …
69Chrome plating — This article is about a chromium electroplating technique. For other uses, see Chrome (disambiguation). Not to be confused with Chromate conversion coating. Decorative chrome plating on a motorcycle Chrome plating, often referred to simply as… …
70Mende people — The Mende people are one of the two largest and most dominant ethnic group in Sierra Leone, along with the Temne. The Mende make up 30% of Sierra Leone s total population [1] or 1,932,015 members. The Southern and Eastern Provinces of Sierra… …
