Interesting background in http://www.npr.org/templates/story/story.php?storyId=112003322 http://www.npr.org/templates/story/story.php?storyId=1120033... The sta

Interesting background in http://www.npr.org/templates/story/story.php?storyId=112003322 http://www.npr.org/templates/story/story.php?storyId=1120033... The standard kilogram has been losing mass over time (when compared to a collection of copies). Apparently, we have been getting progressively less banana... (about 50 parts per billion between these comparison exercises)