Retell one invention from the video by Vincy Yang https://padlet.com/yangweidear/39j2vi24ogwstodb en-us 2025-05-26 06:28:35 UTC 2025-05-26 06:45:55 UTC hello@padlet.com Retell one of the videos talking about ancient Chinese inventions yangweidear https://padlet.com/yangweidear/39j2vi24ogwstodb/wish/3467144241 2025-05-26 06:31:49 UTC https://padlet.com/yangweidear/39j2vi24ogwstodb/wish/3467144241