loosely packed structure
71Atomic nucleus — A figurative depiction of the helium 4 atom with the electron cloud in shades of gray. In the nucleus, the two protons and two neutrons are depicted in red and blue. This depiction shows the particles as separate, whereas in an actual helium atom …
72Dugout (shelter) — Dugout home near Pie Town, New Mexico, 1940. A dugout or dug out, also known as a pithouse, pit house, earth lodge, mud hut, is a shelter for humans or domesticated animals and livestock based on a hole or depression dug into the ground. These… …
73palm — palm1 /pahm/, n. 1. the part of the inner surface of the hand that extends from the wrist to the bases of the fingers. 2. the corresponding part of the forefoot of an animal. 3. the part of a glove covering this part of the hand. 4. Also called… …
74Textile manufacturing terminology — The manufacture of textiles is one of the oldest of human technologies. In order to make textiles, the first requirement is a source of fibre from which a yarn can be made, primarily by spinning. (Both fibre and fiber are used in this article.)… …
75Boolean algebra (introduction) — Boolean algebra, developed in 1854 by George Boole in his book An Investigation of the Laws of Thought , is a variant of ordinary algebra as taught in high school. Boolean algebra differs from ordinary algebra in three ways: in the values that… …
76Law, Crime, and Law Enforcement — ▪ 2006 Introduction Trials of former heads of state, U.S. Supreme Court rulings on eminent domain and the death penalty, and high profile cases against former executives of large corporations were leading legal and criminal issues in 2005.… …
77ancient Rome — ▪ ancient state, Europe, Africa, and Asia Introduction the state centred on the city of Rome. This article discusses the period from the founding of the city and the regal period, which began in 753 BC, through the events leading to the… …
78Glossary of textile manufacturing — For terms specifically related to sewing, see Glossary of sewing terms. For terms specifically related to dyeing, see Glossary of dyeing terms. The manufacture of textiles is one of the oldest of human technologies. To make textiles, the first… …
79Lymphatic system — Infobox Anatomy Name = Lymphatic System Caption = An image displaying the lymphatic system.The lymphatic system in vertebrates is a network of conduits that carry a clear fluid called lymph. It also includes the lymphoid tissue through which the… …
80Stone Age — The Stone Age is a broad prehistoric time period during which humans widely used stone for toolmaking.Stone tools were made from a variety of different kinds of stone. For example, flint and chert were shaped (or chipped ) for use as cutting… …
