A new healing gel helped mice regrow brain tissue after a stroke, and scientists suspect someone out there is producing a bunch of ozone-destroying CFCs in defiance of an international agreement! Hosted by: Hank Green Head to scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Jerry Perez, Lazarus G, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali. Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: Brain Gel: www.nature.com/articles/s41563-018-0083-8 mentalhealthdaily.com/2014/03/04/myths-of-things-that-kill-brain-cells-alcohol-cell-phones-marijuana-et-al/ www.health.harvard.edu/mind-and-mood/can-you-grow-new-brain-cells www.scientificamerican.com/article/does-the-adult-brain-really-grow-new-neurons/ www.stroke.org/understand-stroke/what-stroke www.ncbi.nlm.nih.gov/pmc/articles/PMC5624240/ www.ncbi.nlm.nih.gov/pmc/articles/PMC3913786/ www.ncbi.nlm.nih.gov/pubmed/25058353 www.ncbi.nlm.nih.gov/pmc/articles/PMC3679365/ www.ncbi.nlm.nih.gov/pmc/articles/PMC4072965/ www.researchgate.net/post/Why_do_neurons_not_have_a_regeneration_property www.theatlantic.com/science/archive/2018/03/do-adult-brains-make-new-neurons-a-contentious-new-study-says-no/555026/ www.eurekalert.org/pub_releases/2003-12/uot-nuo121903.php www.eurekalert.org/pub_releases/2018-05/uoc--mrb051718.php www.ncbi.nlm.nih.gov/pmc/articles/PMC3093230/ www.who.int/cardiovascular_diseases/en/cvd_atlas_15_burden_stroke.pdf?ua=1 CFC-11: www.nature.com/articles/s41586-018-0106-2 www.washingtonpost.com/news/energy-environment/wp/2018/05/16/someone-somewhere-is-making-a-banned-chemical-that-destroys-the-ozone-layer-scientists-suspect/ www.livescience.com/62603-new-cfcs-enter-ozone-layer.html pubs.acs.org/doi/abs/10.1021/je990337k?journalCode=jceaax www.bbc.co.uk/schools/gcsebitesize/science/triple_ocr_gateway/chemistry_out_there/depletion_of_ozone/revision/2/ www.epa.gov/ghgemissions/understanding-global-warming-potentials legalresponseinitiative.org/wp-content/uploads/2013/04/BP14E-Briefing-Paper-Sanctions-and-penalties-in-environmental-treaties-19-July-2010.pdf[PDF] pages.ucsd.edu/~dgvictor/publications/Victor_Article_1996_Early%20Operation%20and%20Effectiveness.pdf[PDF] Images: www.eurekalert.org/multimedia/pub/170890.php commons.wikimedia.org/wiki/File:Ozone_2001sept17_lrg.jpg