cancelling effect
81Apollo program — insignia Apollo 11 astronaut Buzz Aldrin walking o …
82Control theory — For control theory in psychology and sociology, see control theory (sociology) and Perceptual Control Theory. The concept of the feedback loop to control the dynamic behavior of the system: this is negative feedback, because the sensed value is… …
83History of France — The History of France has been divided into a series of separate historical articles navigable through the list to the right. The chronological era articles (highlighted in blue) address broad French historical, cultural and sociological… …
84Lleyton Hewitt — Infobox Tennis player playername = Lleyton Hewitt country = Australia residence = Sydney, New South Wales datebirth = birth date and age|1981|2|24|df=yes placebirth = Adelaide, South Australia Spouse = Bec Hewitt height = height|m=1.80 weight =… …
85Quark — In physics, a quark (IPAEng|kwɔrk, IPAEng|kwɑːk or IPAEng|kwɑːrk) is a type of subatomic particle. [cite web |title=Fundamental Particles |publisher=Oxford Physics |url=http://www.physics.ox.ac.uk/documents/pUS/dIS/fundam.htm |accessdate=2008 06… …
86Tube sound — (or valve sound) is the characteristic sound associated with a vacuum tube based audio amplifiers. Some audiophiles prefer the sound that is produced by the distortion characteristics of tube based amplifiers. The audible significance of tube… …
87The Count of Monte Cristo —   …
88Electrical generator — In electricity generation, an electrical generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction. The reverse conversion of electrical energy into mechanical energy is done by a motor …
89Golden Age of American animation — The Golden Age of American animation is a period in American animation history that began with the advent of sound cartoons in 1928, with a peak between the second half of the 30s and the first half of the 1940s, and continued into the early… …
90Aerospike engine — The aerospike engine is a type of rocket engine that maintains its aerodynamic efficiency across a wide range of altitudes through the use of an aerospike nozzle. It is a member of the class of altitude compensating nozzle engines. A vehicle with …
