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In the runup to the 2003 invasion of Iraq, press stories appeared in the United Kingdom and United States of a plastic shredder or wood chipper into which Saddam and Qusay Hussein fed opponents of their Baathist rule.
The largest machines used in wood processing, often called "Tub or Horizontal Grinders", may handle a material diameter of 2.4 m (8 ft) or greater, and use carbide tipped flail hammers to pulverize wood rather than cut it, producing a shredded wood rather than chip or chunk. These machines usually have a power of 150–750 kW (200–1,000 hp).
In 2005, when the city of Boston labeled their official decorated tree as a holiday tree, the Nova Scotian tree farmer who donated the tree responded that he would rather have put the tree in a wood chipper than have it named a "holiday" tree. [12]
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Plant domestication is seen as the birth of agriculture. However, it is arguably proceeded by a very long history of gardening wild plants. While the 12,000 year-old date is the commonly accepted timeline describing plant domestication, there is now evidence from the Ohalo II hunter-gatherer site showing earlier signs of disturbing the soil and cultivation of pre-domesticated crop species. [8]
When testing wood in lumber form, the Janka test is always carried out on wood from the tree trunk (known as the heartwood), and the standard sample (according to ASTM D143) is at 12% moisture content and clear of knots. [3] The hardness of wood varies with the direction of the wood grain. Testing on the surface of a plank, perpendicular to the ...
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