A man poses with a Zimbabwean bank note at a bank in central Harare on June 15, 2015. Zimbabweans are exchanging old notes of local dollars for US dollars, as President Robert Mugabe’s government seeks to officially bury the worthless currency. The southern African country started using foreign currencies like the US dollar and South African rand in 2009 after the Zimbabwean dollar was ruined by hyper-inflation, which hit 500 billion percent in 2008