# A robot may not injure a human being or, through inaction, allow a human being to come to harm. 
# A robot must obey the orders given to it by human beings except where such orders would conflict with the First Law. 
# A robot must protect its own existence aslong as such protection does not conflict with the First or Second Laws. 
# ---I. Asimov "I, Robot", p. 40.
#    from http://www.cs.utexas.edu/users/chaput/research/Rodney/html/rules.html