Think vaccines are perfect? They actually work too well, and that’s the problem most people don’t notice. Millions of lives saved, diseases nearly wiped out… and now most of us don’t even remember how bad they used to be. Survivorship bias at its finest.

From measles to polio, tetanus to smallpox, this video lays out how vaccines transformed the world, and why forgetting their impact is dangerous. If you think “Measles doesn’t affect us,” think again! That’s only because the people it used to kill aren’t around to tell the story anymore.

Watch now and see why ignorance, not vaccines, is the real epidemic.