Voltaire — To learn who rules over you, simply find out who you are not allowed to criticize
Saturday, June 23, 2012
IQ and identical twins
Monozygotic (identical) twins raised apart are more similar in IQ (74%) than dizygotic (fraternal) twins raised together (60%) and much more than parent-children pairs (42%); half-siblings (31%); adoptive siblings (29%-34%); virtual twins, or similarly aged but unrelated children raised together (28%); adoptive parent-child pairs (19%) and cousins (15%). Nothing but genes can explain this hierarchy.