"Its the most breathtakingly ironic things about living: the fact that we are all-identical twins included-alone. Singular. And yet what we seek-what saves us-is our connection to others."

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Identical twins are ideal lab specimens for studying the difference between learned and inherited traits since they come from the womb preloaded with matching genetic operating systems. Any meaningful differences in their behaviors or personalities are thus likely to have been acquired, not innate.

— Jeffrey Kluger