Lost Technology of the Ancient Chinese 42 - Deep Drills. The Ancient Chinese were amazing! Now… not so much. https://www.quora.com/History-Is-there-such-thing-as-Lost-Technology-or-is-that-a-myth/answer/John-Larase?srid=TwE&share=69795d40
Lost Technology of the Ancient Chinese 42 - Deep Drills. The Ancient Chinese were amazing! Now… not so much. https://www.quora.com/History-Is-there-such-thing-as-Lost-Technology-or-is-that-a-myth/answer/John-Larase?srid=TwE&share=69795d40