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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. Fastest man-made object - Wikipedia

   en.wikipedia.org/wiki/Fastest_man-made_object

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5. Five times a manhole cover stopped F1 in its tracks

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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. Manhole cover lifter can save the back of workers

   www.aol.com/manhole-cover-lifter-save-back...

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8. Orders of magnitude (speed) - Wikipedia

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

   Atmospheric entry speed of the Galileo atmospheric probe—Fastest controlled atmospheric entry for a human-made object. 66,000: 240,000: 150,000 0.00022: Lower speed bound of the steel plate cap from the Pascal-B nuclear test of Operation Plumbbob. [26] [circular reference] 70,220: 252,800: 157,100 0.00023: Speed of the Helios 2 solar probe ...

9. Bubbling green sludge leaks from New York City manhole cover ...

   www.aol.com/bubbling-green-sludge-leaks-york...

   A bright green liquid leaked from a New York City manhole cover in bizarre footage. There's literal green sludge bubbling up from the ground next to World Trade Center right now,” Dan Pantelo ...