Sorry, for going a bit of topic, but I perked up my ears at this sentence: >For example, there are many studies on identical twins separated at birth who are a

Sorry, for going a bit of topic, but I perked up my ears at this sentence: >For example, there are many studies on identical twins separated at birth who are adopted by different families. How the hell are there 'many' studies on this? I'd think this Prince and the Pauper scenario would be so fantastic, that there'd be no more than a dozen cases, owing to the extreme rarity of circumstances which all need to happen for this sensational scenario to come about. Or do psychiatrists make sure somehow that identical twins in orphanages are adopted with people from different socioeconomic strata?