By 900 A.D., the Mayan culture began to decline. It is not entirely clear as to why, however, many historians believe that war broke out between different members of royal families. This civil war made farming difficult, and as a result, many people died from hunger and disease. By the late 900s A.D., almost all signs of this once great civilization were gone.
Intelligence without ambition is a bird without wings.
C. Archie Danielson
On October 1874 Joseph Glidden received a patent for barbed wire. There were many lawsuits over the patent, and Glidden won every one of them. Eventually more than two thousand variations of barbed wire were developed.