21 Surprising things you may have inherited from your parents

How aggressive you were as a toddler

If your Terrible Twos were a little more intense than normal, it may have been your parents’ fault—but not because of their shoddy parenting skills. According to researchers at the University of Montreal, frustratingly aggressive behaviors like hitting, biting, and kicking in early childhood have more to do with genetics than environmental factors. Luckily, this behavior won’t necessarily continue, as long as it’s dealt with mindfully and carefully.