École Polytechnique massacre

So, there was a really bad thing that happened at a school in Canada called École Polytechnique. A long time ago, a man went into the school with a gun and he hurt a lot of people there. He was very angry because he didn't like that there were girls at the school who wanted to be engineers. He hurt many students and teachers, and some of them even died. This is called 'massacre', which means when a lot of people are hurt or killed in a situation like this. It was a very sad and scary thing, and we should always remember and try to make sure nobody else gets hurt in this way.