How Are These Prehistoric Technologies Still Unexplained?

A magnetic bar buried in the Mexican jungle, hilltop walls melted into glass, granite drilled with nothing but copper and sand: the deep past is full of technologies that worked brilliantly and then simply vanished. From the stone vases beneath Egypt's first pyramid to the bronze mirrors that shine a hidden image through solid metal, each one was mastered by people who never wrote down how they did it. Follow the evidence, the experiments and the rival theories to find out why some of history's most remarkable skills died with the hands that held them. Chapters: 00:00 - The Olmec Hematite Compass 05:22 - The Vitrified Forts Of Scotland 10:39 - Petrie's Giza Drill Cores 15:58 - The Predynastic Egyptian Hard-Stone Vases 20:55 - The Harappan Ernestite Drills 25:39 - The Han Dynasty Magic Mirrors 30:43 - Greek Fire 35:29 - Damascus Steel #GreekFire #DamascusSteel Sources: The Olmec Hematite Compass (Artifact M-160, San Lorenzo) — https://www.science.org/doi/10.1126/s... The Vitrified Forts of Scotland (Tap o' Noth & Craig Phadrig) — https://www.archaeology.org/news/6585... Petrie's Giza Drill Cores — https://collections.ucl.ac.uk/Details... The Predynastic Egyptian Hard-Stone Vases (Step Pyramid Vessels) — https://veronicasart.com/high-precisi... The Harappan Ernestite Drills (Dholavira Long Carnelian Beads) — https://www.harappa.com/content/new-l... The Han Dynasty "Magic Mirrors" — https://arxiv.org/pdf/physics/0512139 Greek Fire — https://www.britannica.com/technology... Damascus (Wootz) Steel — https://pubmed.ncbi.nlm.nih.gov/17108...