Here's something to think about the next time you clean your windshield. Hosted by: Hank Green ---------- Fritz Haber: www.youtube.com/watch?v=tdEE5uvFhOM Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn't make SciShow without them! Shout out to Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Bryce Daifuku, Chris Peters, Patrick D. Ashmore, Charles George, Bader AlGhamdi ---------- 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: qi.com/infocloud/guano 99percentinvisible.org/episode/guano-mania/ ushistoryscene.com/article/guano-islands-bird-turds/ www.atlasobscura.com/articles/when-the-western-world-ran-on-guano www1.american.edu/ted/guano.htm americanhistory.si.edu/blog/what-load-guano-5-facts-you-didnt-know-about-bird-poop americanhistory.si.edu/norie-atlas mygeologypage.ucdavis.edu/cowen/~gel115/115CH16fertilizer.html manoa.hawaii.edu/hpicesu/papers/1994_the_guano_islands.pdf books.google.com/books?id=LbIEXKafflMC&q www.academia.edu/1788506/Influence_of_Seabird_guano_and_Camelid_dung_fertilization_on_the_nitrogen_isotopic_composition_of_field-grown_maize_Zea_mays_ www.plantphysiol.org/content/116/2/447.full journals.plos.org/plosone/article?id=10.1371/journal.pone.0033741 modernfarmer.com/2015/05/get-a-load-of-our-manure-guide/ Images commons.wikimedia.org/wiki/File:The_Guano_and_Peruvian_Booby_Birds_(6990616208).jpg upload.wikimedia.org/wikipedia/commons/3/3f/DSCN5766-guano-glantz_crop_b.jpg en.wikipedia.org/wiki/Guanay_cormorant#/media/File:Leucocarbo_bougainvillii_qtl2.jpg