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Why firstborn children tend to be smarter than their siblings

First-borns are known to hold the authority over their younger sibling since they are the eldest among the siblings. First-borns are expected to be respected by their younger siblings and ensure that peace and order are maintained when their parents are not around. But did you know that aside from having authority and responsibility for

You fight, you argue, then you make up, and share secrets — these are just some of the usual scenarios you would be quite familiar with if you have a sister. No matter how annoying growing up with a sister can be, science gave its verdict: having a sister can help make you a better person.