We’ve lost the secret to making some of history’s most useful inventions, and for all of our ingenuity and discoveries, our ancestors of thousands of years ago are still able to baffle us with  their ingenuity and discoveries. We have developed the modern equivalent of some of these inventions, but only very recently.

1. Greek Fire: Mysterious Chemical Weapon

The Byzantines of the 7th to 12th centuries hurled a mysterious substance at their enemies in naval battle. This liquid, shot through tubes or siphons, burned in water and could only be extinguished with vinegar, sand, and urine. We still don’t know what this chemical weapon, known as Greek fire, was made of. The Byzantines guarded the secret jealously, ensuring only a select few knew the secret, and the knowledge was eventually lost altogether.

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2. Flexible Glass: A Substance Too Precious

Three ancient accounts of a substance known as  vitrum flexile, flexible glass, are not clear enough to determine that this substance actually existed. The story of its invention was first told by Petronius (63 AD).

Continue here: Ancient Origins