Updated timelines

Steven Timeline
Alex Johnson Astronomy Timeline
Astronomy Timeline
Astronomy Timeline
The Nation Breaking Apart
Modern Astronomy
The Nation Breaking Apart Timeline
Genocide in rewanda
History of the Chesapeake Bay
Jackson era
When did technology start?
Genocide in Rwanda
Mitchell B War of 1812
The Nation Breaking Apart Timeline
Wilmont Proviso
Cartas com comunicados científicas inauguram uma nova forma de ensino aprendizagem