He has been designing play equipment for more than 25 years and his the originator of the continuous play concept used in nearly all of today's play systems. Portnoy answers your questions on video game violence. Tom Griffiths, Ed. D., Director of aquatics and safety officer for athletics at Penn State University on acquatic safety and maintenance. Dr. Donald H. Marx, chairman and principal scientist of Plant Health Care Inc., Pittsburgh, Pa., a leading microbial biotechnology company.
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