Wikijunior talk:How Things Work/Wedge

=References=
 * http://en.wikipedia.org/wiki/Stone_tools#Paleolithic_tools
 * http://en.wikipedia.org/wiki/Wedge_%28mechanical_device%29#Examples_for_lifting_and_separating
 * http://en.wikipedia.org/wiki/Palaeolithic
 * http://en.wikipedia.org/wiki/Oldowan