Hero of Alexandria described a remarkable coin-operated dispensing mechanism. Hero of Alexandria was a mathematician and engineer active during the first century AD. The process required no electricity or electronic https://pocketcasts.com/podcast/huy-hoang-podcast/1eef9730-8383-013f-f21c-0affd341b2cf/e39life/014841df-e3f5-4184-8909-637505cddd76?hl=en