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.
The surest way to lose a friend is tell him something for his own good.
Grand Rapids, Michigan was the 1st US city to fluoridate its water in 1945.