Science timelines:

from http://www.livescience.com/44158-multiverse-cosmic-inflation-gravitational-waves.html March 18, 2014

from http://commons.wikimedia.org/wiki/File:Geologic_time_scale.jpg July 2, 2014

from http://en.wikipedia.org/wiki/Cosmic_Calendar July 2, 2014

from http://en.wikipedia.org/wiki/Timeline_of_evolutionary_history_of_life July 8, 2014

from http://smithsonianscience.org/2014/07/human-evolution-rewritten-flexible-response-climate-change/ July 9, 2014

from http://en.wikipedia.org/wiki/Reionization Sept. 10, 2014

from http://en.wikipedia.org/wiki/Dark_energy April 16, 2015

from http://en.wikipedia.org/wiki/Extinction_event April 22, 2015

from http://en.wikipedia.org/wiki/File:Phanerozoic_Climate_Change.png May 6, 2015

from http://en.wikipedia.org/wiki/File:65_Myr_Climate_Change.png May 6, 2015

  from http://en.wikipedia.org/wiki/File:Five_Myr_Climate_Change.png May 6, 2015

from https://en.wikibooks.org/wiki/High_School_Earth_Science/Geologic_Time_Scale#Geologic_Time_Scale Oct. 21, 2015

from https://en.wikipedia.org/wiki/Search_for_extraterrestrial_intelligence#History_of_SETI April 14, 2016 (September 17, 2016, see https://en.wikipedia.org/wiki/Chronology_of_the_universe#Summary ) NB -SEE https://en.wikipedia.org/wiki/Template:Life_timeline and  https://en.wikipedia.org/wiki/Template:Human_timeline and https://en.wikipedia.org/wiki/Template:Nature_timeline

from https://en.wikipedia.org/wiki/Template:Human_timeline Mar. 8, 2017