XI'AN, CHINA - MARCH 24:  First Lady Michelle Obama with her daughters Malia Obama and Sasha Obama, mother Marian Robinson visit Museum of Terracotta Warriors during a visit to the historic excavation site on March 24, 2014 in Xi'an, China.  Michelle Obama's one-week-long visit in China will be focused on educational and cultural exchanges.  (Photo by Feng Li/Getty Images)