Ergonomic Tip of the Week Tip# 18When placing items on shelves, store the heaviest items in the middle shelves and the lightest objects on the top and bottom shelves. Also, be sure your book shelf is secured and seismically braced
Direct Link: http://www.staples.com/sbd/cre/tech-services/explore-tips-and-advice/infographs/the-current-state-of-office-ergonomics.html
http://www.entrepreneur.com/article/226034
Very interesting read