Boys that are treated as first-born have higher IQ
Before studies said that first-born sons have a higher IQ than their siblings. However, a new study further refines the findings and report that the child treated as the eldest has the highest IQ. The main reason:
The elder child pulls ahead, he said, perhaps as a result of learning gained through the process of tutoring younger brothers and sisters.
It goes back to my own idea that I haven’t learnt something unless I am able to teach it to others. That means I have internalised the knowledge I wanted to learn.
綠茶納豆パンダ 
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