Our instincts about morality, like everything else about us, must have evolved to enhance our reproductive fitness in a certain environment. But like our instincts about what to eat, our moral instincts aren't always well adapted for the modern world. For that reason—and also because reproductive fitness is not the only thing we care about—our instincts are worth reexamining and occasionally transcending. Steven Landsburg

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Added on: July 8, 2011