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http://www.timelineindex.com/content/view/1228
http://www.columbia.k12.mo.us/jjhs/Technology/S&E0506/khanm/democratis.html
http://www.school-for-champions.com/biographies/aristotle.htm
http://www.kidsnewsroom.org/elmer/infoCentral/frameset/decade/1900.htm
http://www.juliantrubin.com/bigten/millikanoildrop.html
http://www.pbs.org/wgbh/aso/databank/entries/bpruth.html
http://www.rutherford.org.nz/
http://www.nzedge.com/heroes/rutherford.html
http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html
http://www.helium.com/items/213494-niels-bohr-and-his-discovery-of-the-atomic-structure
http://www.lucidcafe.com/library/95oct/nbohr.html
http://www.britannica.com/EBchecked/topic/528287/Erwin-Schrodinger
http://www.britannica.com/EBchecked/topic/528298/Schrodinger-equation
http://www.pbs.org/wgbh/aso/databank/entries/bpschr.html
http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Heisenberg.html
http://www.pbs.org/wgbh/aso/databank/entries/bpheis.html
https://www.angelfire.com/pe2/chemclass/majordiscovery_heis.html
http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html
http://www.colorado.edu/physics/2000/periodic_table/neutron_evidence.html