From NPR's Planet Money:
Watch the world's population age over time.
http://www.npr.org/blogs/money/2013/12/09/247385046/the-global-population-boom-and-bust-in-4-gifs
Watch the world's population age over time.
http://www.npr.org/blogs/money/2013/12/09/247385046/the-global-population-boom-and-bust-in-4-gifs
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