It is a truism that a picture is worth a thousand words. In fact, the best pictures – the first-ever photo of Earth-rise taken from the Apollo 8 spacecraft in 1968, the iconic snap of a man confronting a line of tanks in Tiananmen Square in 1989, aerial shots of the Amazon rainforest’s seemingly infinite green blanket – are worth a million words, and maybe more. They are pictures that not only say a lot, they mean a lot.
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