Cases of identical twins separated at birth who were outlined in this study indicated that only one third of our ability to think creatively is genetic. (inc.com)
They looked like twins separated at birth, except one was upside down. (alephblog.com)
Identical twins separated at birth who grew up normally differ by a 4 or 5 and this led Jensen to conclude that three quarters of IQ gains were genetic and only a quarter was environmental, for obvious reasons; you know, identical twins have identical genes. (scientificamerican.com)