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41Oceanic 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… …
42Ballbot — The Ballbot is a mobile robot, an attempt to solve the robotic unicycle problem, and is designed to balance itself on its single spherical wheel while travelling about. It is the focus of the Ballbot Research Platform, a project conducted at… …
43Onychophora — Temporal range: 40–0 Ma …
44fan — fan1 [ fæn ] noun count ** 1. ) someone who likes watching or listening to something such as a sport, movies, or music very much or who admires a famous or important person very much: a football/baseball/tennis etc. fan: a crowd of noisy football …
45step — [n1] pace of feet in walking footfall, footprint, footstep, gait, impression, mark, print, spoor, stepping, stride, trace, track, trail, tread, vestige, walk; concept 149 step [n2] action, move act, advance, advancement, deed, degree, expedient,… …
46Augustan prose — is somewhat ill defined, as the definition of Augustan relies primarily upon changes in taste in poetry. However, the general time represented by Augustan literature saw a rise in prose writing as high literature. The essay, satire, and dialogue… …
47Xiangqi — Chinese chess redirects here. For other uses, see Chinese chess (disambiguation). Xiangqi Xiangqi board with pieces in their starting positions Genre(s) Board game Players 2 …
48Velvet worm — Taxobox name = Onychophora fossil range = Cambrian – Recent image width = 250px image caption = Velvet worm regnum = Animalia phylum = Onychophora phylum authority = Grube, 1853 subdivision ranks = Extant families subdivision = Peripatidae… …
49Reactionless drive — A reactionless drive (also known by many other names, such as an inertial propulsion engine, reactionless thruster, reactionless engine, bootstrap drive or inertia drive) is a fictional or theorized method of propulsion where thrust is generated… …
50rock — rock1 [ rak ] noun *** 1. ) uncount the hard solid substance that forms part of the Earth s surface: Rain water flows through soil and porous rock to reach underground streams. We had to dig down through a twelve inch layer of rock. a ) count a… …
