Lost inventions

• Greek fire
• Damascus steel
• Flexible glass
• Starlite
• Sloot Digital Coding System
• Silphium contraceptives
• Artificial petrifaction of human cadavers invented by Girolamo Segato
• Construction technique involved at Saksaywaman where blocks were put into place by carving them precisely. The method used to match precisely the shape of a stone with the adjacent stones is unknown
• The construction techniques used by Edward Leedskalnin to single-handedly lift massive coral blocks in the creation of his Coral Castle