interlocking disk
41Nanotechnology-Small Is Beautiful — ▪ 2005 The popular media were abuzz in 2004 with a new term, nanotechnology, which refers to the manufacture of materials and devices at an extremely small scale. The prefix nano derives from the Greek nanos, meaning “dwarf.” A nanometre is …
42tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
43Timeline of computing hardware 2400 BC–1949 — History of computing Hardware before 1960 Hardware 1960s to present Hardware in Soviet Bloc countries Artificial intelligence Computer science Operating systems Programming languages …
44List of words having different meanings in British and American English: A–L — Differences between American and British English American English …
45Weaponry — During the WARS OF THE ROSES, English MEN AT ARMS carried various types of weapons into battle, including thrusting and stabbing implements, such as swords and daggers, and powerful battering weapons, such as maces and poleaxes. For close… …
46Japan — <p></p> <p></p> Introduction ::Japan <p></p> Background: <p></p> In 1603, after decades of civil warfare, the Tokugawa shogunate (a military led, dynastic government) ushered in a long period of… …
