ABSTRACT
Siblings fight. While I cannot speak for females, I can say that male siblings born 18 months apart go out of their way to cause chaos for each other.
It is not uncommon, for example, for a 14-year-old brother to lie in wait and shoot his 16-year-old sibling in the back with a paperclip launched from a rubber band. The 14-year-old (of course) states that this was all a school project measuring the concepts of velocity and the nature of impact-in short, physics. To make the experiment more effectual, he waits until his brother has gotten out of the shower and is wearing nothing more than a towel.
