For decades, medical experts were puzzled by the reasons for the bizarre behavior exhibited by some children both here in the U.S. and in other parts of the world. Our family also personally experienced the similar long period of wonderment, having had a son diagnosed with Autism at an early age. He is now 40 years old and living in a group home. Today, medical research is beginning to suspect its cause.
Some common sense proof can be found at:
http://articles.mercola.com/sites/articles/archive/2005/05/04/amish-autism-part-one.aspx