KASUGA, Fukuoka Prefecture--Prehistoric people in Japan apparently used an advanced system of weights and measurements on a decimal basis, excavations at a Yayoi Pottery Culture Period (1000 B.C.-A.D. 250) site here suggest.
Researchers identified what is known as a decuple weight with 10 times the reference unit mass of 11 grams among artifacts unearthed at a series of archaeological sites collectively known as the Sugu group, where many measurement weights have previously been discovered, the Kasuga municipal board of education said.