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- Timeline of the united states history 1990 to present (16426 bytes)
20: ... Edward Snowden leaks highly classified documents from the National Security Agency.
52: ...orge H. W. Bush dies from complications resulting from Parkinson's disease. He lies in the state at th...
54: ...Washington bans all persons under 21 years of age from purchasing a semi-automatic rifle.
55: ...ernment shutdown in American history, which lasts from December 22, 2018 to *January 25, 2019 (35 days...
56: ...ortions of the United States are hit with a polar vortex. The city of Chicago once again hit a record low:... - Tornado (14220 bytes)
3: ...nnel-shaped]] [[cloud]]. The word "tornado" comes from the [[Spanish language|Spanish]] or [[Portugues...
8: ...ly, though tornadoes over water ([[waterspout]]s) frequently are observed forming in the absence of co...
10: ...n (the mesocyclone) is often a lower area of rain-free cloud and can be seen as a rotating "[[wall clo...
12: ...usually form in sweeps north and jet streams come from the west, creating a situation in which the sto...
32: ...dar]] wind speed data, or [[empirical]]ly derived from structural damage compared to engineering data.... - Saturn (planet) (23300 bytes)
137: '''Saturn''' is the sixth [[planet]] from the [[Sun]]. It is a [[gas giant]], the second-...
142: ...nterior, the droplets of helium releasing heat by friction as they fall down through the lighter hydro...
143: [[Image:Saturn polar vortex.jpg|180px|left|thumb|Saturn's temperature emissio...
144: ...imaging have shown that Saturn has a warm polar [[vortex]], and is the only planet in the solar system kno...
147: ...I'', based on [[radio astronomy|radio]] emissions from the planet, has a period of 10 h 39 min 22.4 s ... - 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. - Roller coaster (14862 bytes)
9: ... lower as some mechanical energy is lost due to [[friction]]. Then the train goes down again, and up, ...
15: ..., it uses whatever method is available to keep it from entering. This can cause a [[cascade]] effect w...
17: ...es regarding when to release a newly-loaded train from the station. One common pattern, used on rides...
21: ...first loop track was probably also built in Paris from an English design in 1846, with a single-person...
23: ...of the "lift hill." By [[1912]], the first [[underfriction]] coaster was developed by [[John Miller (e... - Cyclone (6571 bytes)
6: ...low-pressure region. [[Pressure gradient force]], from high- to low-pressure reasons, causes high wind...
12: ...form over warm ocean waters and draw their energy from the evaporation and condensation of that water....
16: ...]] will develop into a [[warm front]], giving the frontal zone a shape (when drawn on a weather chart)...
20: ... precipitation that is associated with the [[warm front]] is often extensive. They tend to move along...
23: ... exhibit characteristics which differentiate them from [[extratropical cyclone]]s. - Nikola Tesla (29894 bytes)
10: ... [[Smiljan]], [[Gospic|Gospić]], [[Military Frontier]], [[Habsburg Monarchy]] (now [[Croatia]])
18: ...d a means to provide [[humanity]] the means for [[Free energy (disambiguation)|unlimited energy]]. He ...
20: ...eas and concepts are just only recently coming to fruition. His legacy can been seen across [[Modern w...
27: * [[induction motor]] and high frequency alternator
34: ...ity for the [[invention]] of [[radio]]) and radio frequency [[electronic oscillator|oscillator]]s
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