Cuemath
Cuemath: Integers
The term "integer" was adapted in Mathematics from the Latin word "integer", which means intact or whole. Integers are very much like whole numbers, but they also include negative numbers. This article explains the properties of integers...
University of Groningen
American History: Essays: The Iron Horse: What Was Impact of the Railroads?
From a lengthy essay on the history of the railroad in the United States. This section describes the positive economic benefits the construction of the railroads provided to the developing nation as a whole, and the negative impact it...