Science and technology

Associated Press
Police officers guard an empty check-in area at the American Airlines section of the Miami International Airport, Tuesday, April 16, 2013.  American Airlines says it has fixed an outage in its main reservations system that is disrupting travel for thousands of passengers whose flights have been delayed or canceled. But the airline expects to see flight delays and cancellations throughout the rest of the day.  (AP Photo/J Pat Carter)

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