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  1. historian

    perpendicular compression fail

    New York Times and others have published that wood slices skull-bone. https://www.nytimes.com/2016/10/18/science/first-boomerang-victim-australia.html Steel compression fail is 100-350Mpa, wood is 1.2-20 Mpa and skull-bone 170-200Mpa.If wood can be surface fire-hardened so that a sharp edge...
  2. historian

    meander bend force in estuary

    I'm looking for confirmation of meander bend force.  This early map may show an island in a bay. ...

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