1) Australian invention 2) Impact crater on Mars 3) Throwing weapon 1) Spear-thrower 
[spear-thrower] A woomera is a wooden Australian Aboriginal spear-throwing device. Similar to an atlatl, it is an extension of the human arm that enables a spear to travel at a greater speed and force than possible with the unaided arm. The town of Woomera in South Australia, founded in 1947 as the home of the Anglo-Australian Long Range We...[spear thrower] = July 9 = == Natural Boundary Condition == Hi, I was reading Lemon`s Perfect Form and it talked about `natural boundary conditions`. But I don`t understand exactly how one determines them. It seems to me that one imposes some random condition then deduce stuff from it...?! Advanced thanks for any enlightenment! — Precedin...
Australian launch complex at 31.1° S, 136.8°E. In the late 1940s, Britain, looking for a large remote area in which to test long-range weapons such as the planned 'Super V-2' settled upon this region of the central Australian desert. Construction and the building of a small town, began in 19...
Stick used by Aborigines to throw spears.
Stick used by Aborigines to throw spears