More about the whole process: http://www.nature.com/news/kilogram-conflict-resolved-at-last-1.18550 http://www.nature.com/news/kilogram-conflict-resolved-at-la

More about the whole process: http://www.nature.com/news/kilogram-conflict-resolved-at-last-1.18550 http://www.nature.com/news/kilogram-conflict-resolved-at-las... Kilogram conflict resolved at last (2015)