U.S. Treasury Secretary Timothy Geithner is in Beijing for a two-day visit to meet with top Chinese government officials including President Hu Jintao and Premier Wen Jiabao. He is there to reassure his Chinese hosts they they need not worry about the $770 billion they've invested in U.S. treasuries. China being the biggest single purchaser of U.S. treasuries. The Takeaway is joined by BBC's Quentin Somerville who is in Beijing and following this closely.