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In 1941, science-fiction writer Isaac Asimov stated "The Three Laws of Robotics," in his short story "Runaround."

Law One: A robot may not injure a human being or, through inaction, allow a human being to come to harm.

Law Two: A robot must obey orders given it by human beings except where such orders would conflict with the First Law.

Law Three: A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

Some encouraging news in the battle against Alzheimer's disease and other forms of dementia: The rate at which older Americans are getting these conditions is declining. That's according to a study published Monday in JAMA Internal Medicine. Researchers say one reason for the improved outlook is an increase in education.

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