Arsenic

Arsenic

       Here's one link on the subject:  http://www.dhs.wisconsin.gov/eh/chemfs/fs/arsenic.htm

            Here's a wiki link on the subject:  http://en.wikipedia.org/wiki/Arsenic

            Here is a World Health Organization (WHO) link on the subject:  http://www.who.int/mediacentre/factsheets/fs372/en/

 

            There are many more links on the subject, too.