balloon structure
51Hang gliding — Hang glider launching from Mount Tamalpais …
52Joseph Kittinger — Joseph W. Kittinger II Joseph W. Kittinger II Nickname Red …
53Nuclear meltdown — Three of the reactors at Fukushima I overheated, causing core meltdowns. This was compounded by hydrogen gas explosions and the venting of contaminated steam which released large amounts of radioactive material into the air.[1] …
54Vega 1 — Infobox Spacecraft Name = Vega 1 spacecraft Caption = Vega 1 Organization = USSR Major Contractors = Mission Type = Flyby, balloon and lander Flyby Of = Venus, Halley Flyby Date = June 11, 1985 (Venus) and March 6, 1986 (Halley) Launch = 1984 12… …
55Pilot certification in the United States — Front side of an airman certificate issued by the FAA …
56Radio masts and towers — Masts of the Rugby VLF transmitter in England …
57Vega 2 — Infobox Spacecraft Name = Vega 2 Caption = Vega 2 Organization = USSR Major Contractors = Mission Type = Flyby, balloon and lander Flyby Of = Venus, Halley Flyby Date = June 15, 1985 (Venus) and March 9, 1986 (Halley) Launch = 1984 12 21 at 09:13 …
587 World Trade Center — Infobox Skyscraper building name=7 World Trade Center The new 7 World Trade Center (view from southeast) construction period=2002–2006 use=Office location=250 Greenwich Street New York City, New York, United States roof=741 ft (226 m) floor count …
59Mass versus weight — The chains on the swing hold all the child’s weight. If one were to stand behind her at the bottom of the arc and try to stop her, one would be acting against her inertia, which arises purely from mass, not weight. In everyday usage, the mass of… …
60Cant frames — Frame Frame, n. 1. Anything composed of parts fitted and united together; a fabric; a structure; esp., the constructional system, whether of timber or metal, that gives to a building, vessel, etc., its model and strength; the skeleton of a… …
