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https://zedie.wordpress.com/2018/06/22/these-1950s-experiments-showed-us-the-trauma-of-parent-child-separation-now-experts-say-theyre-too-unethical-to-repeat-even-on-monkeys/
These 1950s experiments showed us the trauma of parent-child separation. Now experts say they're too unethical to repeat—even on monkeys