There are several reported routes of transmission of the rabies virus. Rabies is most often transmitted through a bite from an infected animal. Less frequently, it can be passed on when the saliva of an infected animal enters another animalâs body through mucous membranes or an open, fresh wound.
Eli Whitney invented a cotton gin. It was an improvement on the roller gins of the time in that it separated seeds from fibers faster and more easily. But his greater achievement was, arguably, the development of interchangeable parts.
Over the course of time, the device and Whitney's techniques were used to make many others products. Elias Howe used it to make the first workable sewing machine in 1846. Clockmakers used it to make metal gears. In making the cotton gin, Eli Whitney had played a major part in expanding slavery.