Ryu Dae Ryeong with his “Running Tortoise” snowchain at the International Exhibition of Inventions in Geneva on April 10, 2013. The event has drawn 725 exhibitors from 45 countries, with lone inventors making up a quarter.
Ryu Dae Ryeong with his "Running Tortoise" snowchain at the International Exhibition of Inventions on April 10, 2013
