Lewis and Clark brought mercury chloride, a strong laxative,...

Lewis and Clark brought mercury chloride, a strong laxative, with them on their expedition across the US.

Because the mercury it contains passes right through the system, archaeologists have been able to find their trail by locating what’s left of their makeshift latrines and testing the mercury content.

More than 100 years later, their footpaths are overgrown, but their poop remains.

(Source, Source 2, Source 3)

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