10 Things We Didn’t Know 100 Years Ago

In just the last century, we’ve made an astounding amount of scientific progress. And thanks to some of that progress, we can now share 10 of those discoveries with you in a video on the internet!

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Sources:
General
http://www.thecentenarian.co.uk/how-many-people-live-to-hundred-across-the-globe.html
http://www.pewresearch.org/fact-tank/2016/04/21/worlds-centenarian-population-projected-to-grow-eightfold-by-2050/
http://www.press.uchicago.edu/Misc/Chicago/284158.html

Discovery of the neutron
https://www.aps.org/publications/apsnews/200705/physicshistory.cfm
http://dev.physicslab.org/Document.aspx?doctype=3&filename=AtomicNuclear_ChadwickNeutron.xml

DNA as a double helix
https://profiles.nlm.nih.gov/SC/Views/Exhibit/narrative/doublehelix.html
https://www.nobelprize.org/educational/medicine/dna_double_helix/readmore.html
https://profiles.nlm.nih.gov/ps/retrieve/Narrative/KR/p-nid/187

Vitamins
http://www.acs.org/content/acs/en/education/whatischemistry/landmarks/szentgyorgyi.html
http://www.karger.com/Article/Abstract/343121
https://profiles.nlm.nih.gov/ps/retrieve/Narrative/WG/p-nid/149
http://www.medicalnewstoday.com/articles/155758.php

Antibiotics
http://www.acs.org/content/acs/en/education/whatischemistry/landmarks/flemingpenicillin.html#alexander-fleming-penicillin
http://www.pbs.org/newshour/rundown/the-real-story-behind-the-worlds-first-antibiotic/
http://amrls.cvm.msu.edu/pharmacology/historical-perspectives

Milky Way
https://www.e-education.psu.edu/astro801/content/l9_p2.html
http://www.wired.com/2009/12/1230hubble-first-galaxy-outside-milky-way/
http://cosmictimes.gsfc.nasa.gov/online_edition/1929Cosmic/andromeda.html
http://apod.nasa.gov/htmltest/gifcity/cs_why.html

Hydrogen
http://cwp.library.ucla.edu/Phase2/Payne-Gaposchkin,_Cecilia_Helena@861234567.html
http://oasis.lib.harvard.edu/oasis/deliver/~hua03004
https://www.noao.edu/education/astrobits/files/Stellar-Spectroscopy-Abits.pdf

Plate Tectonics
http://www.ucmp.berkeley.edu/geology/techist.html
http://www.earthobservatory.sg/faq-on-earth-sciences/brief-history-plate-tectonics-theory
https://www.e-education.psu.edu/earth520/content/l2_p2.html
http://www.geolsoc.org.uk/Plate-Tectonics/Chap1-Pioneers-of-Plate-Tectonics/Harry-Hess

Out of Africa Theory
http://www.mhrc.net/mitochondrialEve.htm
http://www.actionbioscience.org/evolution/johanson.html
http://io9.gizmodo.com/more-evidence-undermines-the-out-of-africa-theory-of-1619420466
http://www3.nd.edu/~afreddos/papers/kemp-monogenism.pdf
http://www.sciencemag.org/news/2012/06/asian-origin-human-ancestors
https://www.sciencedaily.com/releases/2007/05/070509161829.htm

Ozone
https://www.ucar.edu/learn/1_6_1.htm
http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1995/press.html
http://www.esrl.noaa.gov/gmd/hats/publictn/elkins/cfcs.html

Einstein
http://www.space.com/17661-theory-general-relativity.html
http://www.cfhtlens.org/public/what-gravitational-lensing
http://physics.ucr.edu/~wudka/Physics7/Notes_www/node98.html