Jon Nelson, of Ritsumeikan University, in Japan, has calculated that the most important property involved is the surface tension of the tiny clusters of water molecules from which snowflakes form.

Research on the Works by Fifty Writers of the Northern Song Dynasty Collected in Si Ku Ti Yao is a monograph by Professor Jian Wenshen and his student, Ms.

Vision scientist Akiyoshi Kitaoka at the Ritsumeikan University in Kyoto, Japan, follows on the footsteps of the great op artists of some decades ago.