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.
Eli Whitney patented his cotton engine, or âgin,â in 1794. A mechanical device to separate cotton fibers from cotton seed, it dramatically lowered the cost of producing cotton fiber. Formerly, workers (usually slaves) had separated the seeds from the lint by hand, painstaking work that required hours of work to produce a pound of lint.