Productivity plunged when WWI munition workers exceeded 49 hours per week on the job. (Draw your own conclusions): http://stanford.io/1vLLX2i
2:37 PM - 9 Dec 2014
0 replies
7 retweets
8 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.