The word boomerang is the name given by a particular tribe of native Australians from New South Wales to their traditional trowing stick. There are two forms of boomberang, the curved one that a skilled thrower can get to come back back and the nearly straight non-return version. The heavier, staright version is used for hunting, but the curved one is used only for hunting birds and as a way to demonstrate skill. Similar throwing sticks have been used in northeasten Africa, India and Arizona. The returning boomerang is decorated on its top side, which is rounded in the middle the left plain and flat on the bottom. When it is thrown correctly, increased air pressure on the rounded upper surface, in comparison with the flat under surface, causes the boomerang to change direction and return to the thrower. The decorations on boomerangs are often symbolic and relate to native Australian mythology.
Fact file
A yo-yo is a child's toy with a string coiled around its middle. If the yo-yo is thrown from the palm of the hand it will sink into a spin at the end of its string before returning back to the hand.
