helium-bearing natural gas
61Nanotube nanomotor — A device generating linear or rotational motion using carbon nanotube(s) as the primary component, is termed a nanotube nanomotor. Nature already has some of the most efficient and powerful kinds of nanomotors. Some of these natural biological… …
62physics — /fiz iks/, n. (used with a sing. v.) the science that deals with matter, energy, motion, and force. [1580 90; see PHYSIC, ICS] * * * I Science that deals with the structure of matter and the interactions between the fundamental constituents of… …
63Extraterrestrial liquid water — Extraterrestrial liquid water, the presence of water in its liquid state, is a subject of wide interest because it is a commonly suggested prerequisite for the emergence of extraterrestrial life. Earth, with oceanic water covering 71% of its… …
64Pern — For pern, the bird, see Honey Buzzard. For the commune in France, see Pern, Lot. Map of Pern (Dutch language) Pern is a fictional planet created by Anne McCaffrey for the Dragonriders of Pern series of fantasy and science fiction books …
65MythBusters (2008 season) — Country of origin Australia United States No. of episodes 20 (includes 8 specials) Broadcast Original channel Discovery Channel …
66Silicon dioxide — Silica redirects here. For other uses, see Silica (disambiguation). Silicon dioxide …
67Lensman series — The Lensman series is a serial science fiction space opera by E. E. Smith. It was also the original source which introduced many innovative concepts into science fiction. In this sense the series was ground breaking and defined an entire genre.… …
68Radiochemistry — is the chemistry of radioactive materials, where radioactive isotopes of elements are used to study the properties and chemical reactions of non radioactive isotopes (often within radiochemistry the absence of radioactivity leads to a substance… …
69Inertial navigation system — An Inertial Navigation System (INS) is a navigation aid that uses a computer and motion sensors to continuously track the position, orientation, and velocity (direction and speed of movement) of a vehicle without the need for external references …
