Knol is a Google project: http://en.wikipedia.org/wiki/Knol The date should be listed on the right. The one posted by North was edited: 13 hours ago. This one from the same author was last edited one day ago. http://knol.google.com/k/krishan-maggon/monoclonal-antibody-market-2009/3fy5eowy8suq3/86#