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  2. Operation Plumbbob - Wikipedia

    en.wikipedia.org/wiki/Operation_Plumbbob

    The operation consisted of 29 explosions, of which only two did not produce any nuclear yield.Twenty-one laboratories and government agencies were involved. While most Operation Plumbbob tests contributed to the development of warheads for intercontinental and intermediate range missiles, they also tested air defense and anti-submarine warheads with smaller yields.

  3. Manhole cover - Wikipedia

    en.wikipedia.org/wiki/Manhole_cover

    A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

  4. Orders of magnitude (speed) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(speed)

    The top speed of the world's fastest roller coaster, Formula Rossa. 90: 320: 200: 3 × 10 −7: Typical speed of a modern high-speed train (e.g. latest generation of production TGV); a diving peregrine falcon—fastest bird; 320 km/h or 200 mph is a parameter sometimes used in defining a supercar. [15] 91: 328: 204: 3.04 × 10 −7

  5. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]

  6. 10 weird things that can kill you almost instantly - AOL

    www.aol.com/news/2016-03-13-10-weird-things-that...

    The powerful forces can be released by any number of space objects, but mighty though they are, detection can be difficult. A strike may occur with no advance warning. On the upside, complete ...

  7. Fastest man-made object - Wikipedia

    en.wikipedia.org/wiki/Fastest_man-made_object

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  8. The Fastest Spinning Object Ever Could Detect the Elusive ...

    www.aol.com/news/fastest-spinning-object-ever...

    Could it be used to detect the elusive vacuum friction?

  9. Supercavitation - Wikipedia

    en.wikipedia.org/wiki/Supercavitation

    A supercavitating object is a high-speed submerged object that is designed to initiate a cavitation bubble at its nose. The bubble extends (either naturally or augmented with internally generated gas) past the aft end of the object and prevents contact between the sides of the object and the liquid.