"You see, when you're excited, your body has trouble telling the difference between pain and pleasure."

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You know, you take a little infant and you turn on the music mobile on their crib and you find that if you give them a music mobile which turns on automatically versus a music mobile in which - if by chance their little legs or their little hands accidentally touches it - turns on they're so much more excited if by chance it turns on because they touched it, so that desire for control over their environment is... really appears from very early on and if you look at children's first words, "no, yes."

— Sheena Iyengar