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Each Sinker weighed 14-52 grams and a diameter of 37-57 millimeters
Invent in 8300 BC. They had grooves in them so they could be attached to a net
Called Cheokugye in Korean
Invented by Jang Yeong-sil
Helped regulate rainfall and improved there agriculture
The Ancient Silla Kingdom invented something called the seokbinggo.
Which were chambers built into small hills and used to store ice, and food
Underfloor Heating dating back 2500 years ago
It was called the Ondol and worked by outside furnace, underfloor pipes, and a special stone that retains heat for long periods and releases it gradually.