The Most Lethal Substance Humans Ever Discovered

What if I told you the deadliest substance on Earth isn’t a bomb, a poison gas, or even a weapon—
but a microscopic toxin smaller than a grain of salt?

Meet Botulinum toxin, produced by Clostridium botulinum.
Just 1 gram could kill over a million people, and only a few kilograms could wipe out the entire human race.
Ironically, in medicine and cosmetics, the same toxin is used safely in tiny doses—better known as Botox.

Sometimes, the deadliest things really do come in the smallest packages.