http://www.helium.com/knowledge/269764-homework-tips-how-a-timeline-helps-history-come-to-life.xml Helium.com > Homework & Testing > Homework tips: How a timeline helps history come to life en-us Copyright Helium.com Thu, 27 Aug 2009 01:49:03 GMT Thu, 27 Aug 2009 01:49:03 GMT