World's Deadliest Substances

The deadliest substance—natural or artificial—known to man is clostridium botulinum. A crystal of this substance the size of a grain of sand would be enough to kill 9,600 people. And these bacteria are actually very common.

Written by Curiosity Staff August 2, 2014

Curiosity uses cookies to improve site performance, for analytics and for advertising. By continuing to use our site, you accept our use of cookies, our Privacy Policy and Terms of Use.