A nun smiles as she holds a vacuum flask containing mate, a traditional drink in Argentina, as Pope Francis arrives to conduct his weekly general audience at St. Peter's Square at the Vatican April 30, 2014. REUTERS/Alessandro Bianchi (VATICAN - Tags: RELIGION) 

Attendants stand behind vacuum bottles as they serve tea to delegates at the Great Hall of the People in Beijing during the second plenary session of China's parliament, the National People's Congress (NPC), March 6, 2004. Nearly 3,000 delegates from across China packed into Beijing's imposing Great Hall of the People for the yearly session of the NPC. REUTERS/Andrew Wong ASW/TW