Growing up, we all experienced occasional fire drills. Emergencies can certainly happen and knowing where to go when a school suddenly becomes unsafe is definitely important. However, by the mid-2000s, we would start incorporating another drill that taught us an unfortunate reality: Leaving a school when it becomes unsafe isn't always possible.
This was the start of what today's children now know as lockdown drills. Although the general idea of turning off the lights and hiding in what seemed like an empty classroom was similar to the modern variants of it, they've only become more sophisticated in the years since.
And as the full video shows, that evolution has happened because surprisingly young children are all too aware of why they're important.