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In 1936, a strange find was discovered near modern-day Baghdad, Iraq. The artifact was called the Baghdad Battery and sparked widespread controversy over its purpose and origins. The debate over the Baghdad Battery continues to this day. It raises questions about the extent of technological knowledge in ancient civilizations and the possibility that certain historical artifacts may represent lost or overlooked advances. Perhaps hundreds or thousands of years ago, people already had knowledge that was far ahead of its time. In this video, we will tell you about several more ancient objects, structures, and technologies that science still cannot explain.