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One of the easiest ways that companies can avoid animal exams are to use items that are already extensively found in human history and also have proven their safety over time. Companies could also depend upon data from natural and synthetic ingredients which are already previously tested on animals. Computer modeling and databases may be used to determine biological properties of ingredients and make risk assessments. If you do not like the image currently showing, right-click on the desktop again and choose "Next desktop background" to see another one. The images will cycle automatically after an interval giving you something stunning to look at. Performance headers are car components that, as his or her name implies increase the performance from the car. To understand them let us first find out how the engine powers your car or truck. The power reaches your car by means of chemical energy kept in the unburnt fuel. It is the auto engine that converts this chemical energy through combustion into mechanical energy and by having a various linkages reaches this mechanical energy on the wheels which drive the vehicle.