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.
Whitney 's invention revitalized slavery in the South by stimulating demand for slaves to raise short-staple cotton. Between 1792, when Whitney arrived on the Greene plantation, and 1794, the price of slaves doubled. By 1825 field hands, who brought $500 apiece in 1794, were worth $1500.