History:About Ballistics
Thousands of years ago， our ancestors used darts for hunting. With the development of the society， arrows took place of the darts， and then the firearms replaced arrows. Nowdays， people have designed all kinds of aerocrafts with the knowledgement of aerodynamics. This video program introduces the evolvement from darts to aerocraft in details and also the aerodynamic informations.
- Added：2006
- Country：Britain
- Duration：60
- Time of update：2011/8/15 11:42:28