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! Hosted by: Michael Aranda ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn t make SciShow without them! Shout out to Kathy & Tim Philip, Kevin Bealer, Andreas Heydeck, Thomas J., Accalia Elementia, Will and Sonja Marple. James Harshaw, Justin Lentz, Chris Peters, Bader AlGhamdi, Benny, Tim Curwick, Philippe von Bergen, Patrick Merrithew, Fatima Iqbal, Mark Terrio-Cameron, Patrick D. Ashmore, and charles george. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- 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