7 Billion: How Did We Get So Big So Fast?

7 Billion: How Did We Get So Big So Fast?

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送交者: conner 于 2011-11-15, 10:37:59:

http://www.youtube.com/watch?v=VcSX4ytEfcE

优等科普。 (无内容) - 湘女 (0 bytes) 2011-11-15, 13:52:48 (628551)
好看！ (无内容) - 伊犁 (0 bytes) 2011-11-15, 13:01:04 (628522)