It's a rematch Battle of The SciShow Hosts on today's quiz show! Will Olivia be victorious again or will Hank "try those logarithms" and win the day? 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: Lazarus G, Sam Lutfi, 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: Rats: science.sciencemag.org/content/354/6313/757/tab-pdf www.sciencemag.org/news/2016/11/watch-these-ticklish-rats-laugh-and-jump-joy time.com/4566126/rats-laughter-tickling/ www.eurekalert.org/pub_releases/2016-11/aaft-rat110716.php Bat flies: parasitesandvectors.biomedcentral.com/articles/10.1186/s13071-016-1625-z www.fieldmuseum.org/sites/default/files/Dick%20&%20Patterson%202006%20MicromammalsMacroparasites.pdf Disk-winged bats: rspb.royalsocietypublishing.org/content/280/1772/20132362 www.livescience.com/40429-speak-up-costa-rican-bats-use-leaves-as-hearing-aids.html Darwin: books.google.com/books?id=ibYtAAAAYAAJ&pg=PA462&lpg=PA462 Green sand: www.lovebigisland.com/quick-and-remarkable-facts-about-hawaii/green-sand-beach/ www.sciencedirect.com/science/article/pii/0377027385900563 web.archive.org/web/20161224052559/https://geomaps.wr.usgs.gov/parks/coast/sand/greensand.html Fire grenades: www.oldhouseweb.com/how-to-advice/common-fire-safety-device-in-old-homes-a-health-hazard.shtml saskmuseums.org/blog/entry/glass-grenade-style-fire-extinguisher-bombs-are-they-safe books.google.com/books?id=fM43Ny2eFS8C&pg=PA134 99percentinvisible.org/article/stop-drop-roll-throw-fighting-fires-fire-grenades/ --------- Images: media.eurekalert.org/scipak/gallery/images/2016-11/ishiyama3.mp4 www.flickr.com/photos/sanmartin/5021769088/in/photolist-8DKSZE-8DKRXY-5mPNyx www.istockphoto.com/photo/curling-leaves-of-a-new-host-leave-gm514849708-88307923 www.istockphoto.com/photo/curling-leaves-of-a-new-host-leave-gm514849698-88307913 www.istockphoto.com/photo/curling-leaves-of-a-new-host-leave-gm514849722-88307937 en.wikipedia.org/wiki/File:Gigantic_Turtle_on_the_Island_of_Santa_Cruz_in_the_Galapagos.JPG en.wikipedia.org/wiki/File:RothschildTortoise.png commons.wikimedia.org/wiki/File:Gemperidot.JPG commons.wikimedia.org/wiki/File:Papakolea_Beach_sand_high_mag_052915.jpg commons.wikimedia.org/wiki/File:Papakolea_snapshot.jpg en.wikipedia.org/wiki/File:Snohomish_-_Blackman_House_Museum_-_Comet_fire_extinguisher_02A.jpg commons.wikimedia.org/wiki/File:Phosgene_poster_ww2.jpg

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