By Tara MacIsaac , Epoch Times 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. Researchers discover secret recipe of Roman concrete that allowed it to endure for over 2,000 years Scientists Discover that Ancient Roman Concrete was Far Superior to Our Own 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
