Britain's Kate, the Duchess of Cambridge, speaks to someone at Baker Street underground station in London, for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013.  Britain's Queen Elizabeth II made her first public engagement in more than a week Wednesday after cancellations following her hospitalization for a stomach bug.  The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube.  (AP Photo/Matt Dunham)
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