00:00Ancient Greeks whispered secrets across huge stadiums.
00:03How?
00:04Textbooks missed the real trick.
00:06It wasn't just perfect curves.
00:08Limestone seats actually absorbed low sounds.
00:11This pushed voices far.
00:13This ancient secret now builds modern concert halls.
00:17Think amazing sound.
00:18Want to unlock more forgotten engineering?
00:21Find more secrets at the Lincoln bio.
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