I’m smarter than you are:
The eldest children in families tend to develop slightly higher I.Q.s than their younger siblings, researchers are reporting, based on a large study that could effectively settle more than a half-century of scientific debate about the relationship between I.Q. and birth order.
[…] Researchers have long had evidence that first-borns tend to be more dutiful and cautious than their siblings, early in life and later, but previous studies focusing on I.Q. differences were not conclusive. In particular, analyses that were large enough to detect small differences in scores could not control for the vast differences in the way that children in separate families were raised.
I still love you though!