Think ancient civilizations were primitive? Think again. From self-healing Roman concrete that outlasts modern formulas to the terrifying Byzantine weapon called Greek Fire whose recipe was lost forever, we're counting down five ancient inventions so advanced that even with our modern labs and supercomputers, we still haven't cracked their secrets—or beaten their performance.
Podden och tillhörande omslagsbild på den här sidan tillhör
Podgo. Innehållet i podden är skapat av Podgo och inte av,
eller tillsammans med, Poddtoppen.
