his decision to do so on land, by rescuing the slow, large, and defenseless camel from the brink of oblivion, reaped similar rewards. Already extinct in North America, and quickly headed for extinction in Eurasia, the camel was first valued, about six thousand years ago, solely for its milk. Not until twenty-five hundred years later, around 1500 BC, would humans begin to exploit the camel’s ability to carry hundreds of pounds of cargo across otherwise impenetrable territory. Without the domestication of the camel, the trans-Asian silk and trans-Arabian incense routes would have been
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