Sometimes, the most significant discoveries are hidden in plain sight. Last month, researchers found a long-lost city submerged near a popular Egyptian cruise port . And a new study has revealed a similar mystery.

Researchers at Yale University’s Ancient Pharmacology Program discovered evidence of a substance in an ancient Egyptian alabaster vessel that would be illegal by today's standards.

Not only does this discovery challenge long-held beliefs about the use of medicine in Ancient Egypt, but it’s also prompting archaeologists to reexamine artifacts uncovered more than a century ago.

Here's a closer look at what researchers found.

Archaeologists Found Traces Of Opium In An Ancient Egyptian Alabaster Vase

Archaeologists have confirmed that an alabaster vase dating back more than 2,

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