Across the United States, politicians are passing laws limiting abortion that are based on the idea that a fetus can feel pain after 20 weeks gestation. But the science underlying this assertion is a lot more complex than it's made out to be. Most scientists don't think fetuses have the neural circuitry to experience pain until later. And the scientists whose research is most often cited as evidence of fetal pain at 20 weeks don't think their work is saying what anti-abortion activists think it does.

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