World's Deadliest Substances

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.

See all



Pioneering Women


Get smarter every day! Like us on Facebook.
You'll get the most interesting and engaging topics in your feed, straight from our team of experts.