The Impossible Hugeness of Deep Time (https://www.youtube.com/watch?v=dI7SbZx_Qiw)
From the Big Bang to the 21st Century (http://timelines.ws/)
Hyperhistory (http://www.hyperhistory.com/online_n2/History_n2/science.html)
marks in the evolution of western thinking about nature (http://www.sciencetimeline.net/)
Earth Impact Chronology (http://worldtimeline.info/impact/)
Strange Science (http://www.strangescience.net/timeline.htm)
chemsoc Timeline (http://www.chemsoc.org/timeline/pages/timeline.html)
Ancient History Timeline (http://library.thinkquest.org/10805/timeline.html)