October 31, 2011 (a Monday)

Train station in Mumbai.

Train station in Mumbai.

As calculated by the United Nations, the seven-billionth human being arrived on Earth on this date. The specter of too many people and not enough food has haunted scientists and philosophers since at least the time of Aristotle. The most famous is Thomas Robert Malthus, who in 1798 grimly predicted that population growth would outpace food production, resulting in human death and misery.

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