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- Timeline of invention (28171 bytes)
6: * 2.4 MYA: [[Oldowan|Stone tools]] in [[Africa]]
8: ...YA: Controlled [[fire]] in [[Cradle of Humankind|Africa]]
26: * [[Cloth]] woven from [[flax]] fiber
112: * [[1589]]: [[Stocking frame]]: [[William Lee]]
134: ...quadrant]]: [[Thomas Godfrey (inventor)|Thomas Godfrey]] - Dean Kamen (2784 bytes)
6: ...[[scooter]] with a complex, computer-controlled [[gyroscope|gyroscopic]] stabilization and control system tha...
20: ...pg=1&topic=&topic_set= Bio of Dean Kamen] – from ''[[Wired Magazine]]'' - Hubble Space Telescope (50930 bytes)
4: ...text-align:center;" | The Hubble Space Telescope, from the [[Space Shuttle Discovery]] during the seco...
8: ...avelength regime'''||optical, ultraviolet, near-infrared
45: ...h, it was found that the main [[mirror]] suffered from [[spherical aberration]], severely compromising...
54: ...be that a space-based telescope could observe [[infrared]] and [[ultraviolet]] light, which are strong...
58: ...observations of [[star]]s and [[galaxy|galaxies]] from its launch in 1968 until 1972, well beyond its ... - Helicopter (20080 bytes)
1: ...wing aircraft</b>. The word helicopter is derived from the [[Greek language|Greek]] words ''helix'' (s...
23: ...tail rotor is sufficient to cancel out the torque fromt the main rotor, the helicopter will not rotate...
29: ... amount of power required to prevent a helicopter from spinning is significant. A tail rotor can use u...
42: ...the RPM is too high, damage to the main rotor hub from excessive forces could result. In general, RPM ...
44: ... The cyclic is usually controlled by the stick in front of the pilot. - Yo-yo (9646 bytes)
3: ... loop around the axle end which allows it to spin freely, or "sleep" upon reaching the string's end.
5: ...th motion. As the axle spins within the loop, a [[gyroscope|gyroscopic]] effect occurs, permitting time to pe...
11: ...ed sharp rocks with strings attached to kill prey from trees. The development of the modern yo-yo bega...
14: [[Image:yoyo_ca500bc.jpg|right|framed|National Museum, Athens]]The yo-yo is a truly...
16: ...s, likely epidemic during that period of [[France|French]] history. - Beryllium (15119 bytes)
141: ...berated when it is hit by [[alpha particle]]s, as from [[radium]] or [[polonium]] (about 30 neutrons/m...
149: * Beryllium is also used in the making of [[gyroscope]]s, various [[computer]] equipment, watch springs...
152: .../Telescope/mirrortale/ (Beryllium related details from NASA here)] will have 18 hexagonal beryllium se...
155: ...[beryl]] and in [[emerald]]s. [[Friedrich Woehler|Friedrich W?r]] and [[Antoine Alexandre Brutus Bussy...
167: ...d to examine [[soil erosion]], [[soil formation]] from [[regolith]], the development of [[laterite|lat... - Uranium (27752 bytes)
165: *beta (tetragonal) stable from 667.7 °C to 774.8 °C
166: *gamma (body-centered cubic) from 774.8 °C to melting point - this is the mos...
170: ...up>233</sup>U isotope is also fissile and is made from <sup>232</sup>[[thorium]] by [[neutron]] bombar...
184: ...natural uranium, because the [[mineral]] material from which they are made is typically high in uraniu...
186: ...und use in [[inertial guidance]] devices and in [[gyroscope|gyroscopic]] [[compass]]es. - Wheel (4678 bytes)
2: ... object that together with an [[axle]] allows low friction in motion, for example, in [[transport]] ap...
7: The low [[friction]] (compared to [[drag]]ging) is explained a...
9: ...Now while the object still moves 10 m the sliding frictional surfaces only slide over each other a dis...
11: ...d at the wheel to road interface, but rather than frictional loss it is now deformation loss which can...
15: ... unknown in [[Sub-Saharan Africa|Sub-saharan]] [[Africa]], [[Australia]], and the Americas until relat... - Motorcycle (40437 bytes)
7: ... of "footpegs" or "pegs" which stick out from the frame.
23: The chassis of a motorcycle is typically made from welded [[aluminium]] or [[steel]] struts, with ...
27: ...some British motorcycles designs used part of the frame as an oil reservoir. The wheel rims are usuall...
29: ...becomes a major source of drag and is pushed back from the handlebars, tiring the rider.
31: ...0pix.jpg|thumb|200px|A British'' ''motorcycle'' ''from 1966, the 250 cc Ariel Leader]] - Unicycle (4804 bytes)
5: ... the wheel, and the seat is located on top of the frame.
13: ...19th century. These bicycles had a large wheel in front, to which the pedals were attached, and a much...
16: ...cling]]. It is a mix of [[unicycle trials]] and [[freestyle unicycling]]. It consists of stair riding,...
27: * [[Ultimate wheel]]: a unicycle with no frame or seat, just a wheel, cranks, and pedals.
29: * [[Coaster Uni]]: a unicycle where the hub freewheels, giving a cross between a traditional uni... - Propeller (12179 bytes)
1: ...force produced is from the difference in pressure from the forward and rear surfaces of the blades.
17: ...the torque of high-power piston engines and the [[gyroscope|gyroscopic]] precession effects of the slipstream...
27: ...cy as the fan is drawing on a smaller area of the free stream and so using less air, this is balanced ...
34: ...include [[William Symington]], the Marquis de Jouffroy, [[John Fitch]] and many others. The American [...
36: ...igned and patented a screw propeller in [[1827]]. Francis Petit Smith tested a screw propeller similar... - Global Positioning System (28209 bytes)
7: ...epartment of Defense]] and can be used by anyone, free of charge.
12: A GPS receiver decodes time signal transmissions from multiple satellites and calculates its position...
23: ...nge]]). It then decodes the satellites' locations from their radio signals and an internal database.
24: ...vation information is already known, only signals from three satellites are needed (the point is then ...
30: ...d of radio waves based on their frequencies, dual frequency receivers can actually measure the effects...
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