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2. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force ... Bronze and brass fasteners - water proof usage;

3. Gunpowder artillery in the Middle Ages - Wikipedia

   en.wikipedia.org/wiki/Gunpowder_artillery_in_the...

   Bronze cannon with an inscription dated the 3rd year of the Zhiyuan era (1332) of the Yuan dynasty (1271–1368); it was discovered at the Yunju Temple of Fangshan District, Beijing, China in 1935. The first documented battlefield use of gunpowder artillery took place on 29 January 1132, when Song General Han Shizhong used huochong to capture a ...

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed. confirmat screw: confirmat screw: Used in particleboard and medium-density fiberboard: elevator bolt: An elevator bolt is a similar to a carriage bolt, except the head (or foot, depending on the application) is thin and flat.

5. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than ⁠ 1 / 4 ⁠ inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.

6. Three-age system - Wikipedia

   en.wikipedia.org/wiki/Three-age_system

   Jōmon pottery, Japanese Stone Age Trundholm sun chariot, Nordic Bronze Age Iron Age house keys Cave of Letters, Nahal Hever Canyon, Israel Museum, Jerusalem. The three-age system is the periodization of human prehistory (with some overlap into the historical periods in a few regions) into three time-periods: the Stone Age, the Bronze Age, and the Iron Age, [1] [2] although the concept may ...

7. Bacteria and 'mold-like' substance found at Tom's of Maine ...

   www.aol.com/bacteria-mold-substance-found-toms...

   An FDA inspection of a Tom’s of Maine manufacturing facility led to the discovery of “significant violations,” including bacteria in water used to make toothpaste and a black “mold-like ...