We can thank the US military for the smelliest weapon in the world

• The US military has attempted to use terrible smells as non-lethal weapons as far back as World War II.
• The Office of Strategic Services invented the "Who, Me" substance, designed for resistance groups to squeeze out of tubes, but it was never deployed.
• We spoke with science writer Mary Roach about the military's decades-long search for the world's worst odor.

• Visit Business Insider's homepage for more stories.

You can read more fascinating stories about humans at war in Roach's new book, "Grunt: The Curious Science of Humans at War."

EDITOR'S NOTE: This video was originally published on July 17, 2016.