Channel: SciShow

Category: Education

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Description: Head to linode.com/scishow to get a $100 60-day credit on a new Linode account. Linode offers simple, affordable, and accessible Linux cloud solutions and services. Our knowledge of specific technologies or techniques can sometimes be lost to time. And that can be because of changing economic conditions, or, sometimes, it's because the technology was so deadly that only a few were allowed to know it. Hosted by: Michael Aranda SciShow is on TikTok! Check us out at tiktok.com/@scishow ---------- Support SciShow by becoming a patron on Patreon: patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Tomás Lagos González, Sam Lutfi. Bryan Cloer, Christoph Schwanke, Kevin Bealer, Jacob, Jason A Saslow, Nazara, Tom Mosner, Ash, Eric Jensen, Jeffrey Mckishen, Matt Curls, Alex Hackman, Christopher R Boucher, Piya Shedden, Jeremy Mysliwiec, charles george, Chris Peters, Adam Brainard, Dr. Melvin Sanicas, Harrison Mills, Silas Emrys, Alisa Sherbow ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: scishow-tangents.simplecast.com Facebook: facebook.com/scishow Twitter: twitter.com/scishow Instagram: instagram.com/thescishow #SciShow ---------- Sources: britannica.com/technology/pozzolana uh.edu/engines/epi2810.htm unews.utah.edu/roman-concrete pubs.geoscienceworld.org/msa/ammin/article/102/7/1435/353606/Phillipsite-and-Al-tobermorite-mineral-cements smithsonianmag.com/history/the-secrets-of-ancient-romes-buildings-234992 britannica.com/technology/concrete-building-material britannica.com/topic/Pantheon-building-Rome-Italy ​​bbc.com/future/article/20210316-the-legendary-fabric-that-no-one-knows-how-to-make uh.edu/engines/epi385.htm library.oapen.org/bitstream/handle/20.500.12657/31335/631166.pdf?sequence=1#page=167 britannica.com/technology/Greek-fire jstor.org/stable/3106585?origin=crossref washingtonexaminer.com/weekly-standard/the-fog-of-war thedrive.com/the-war-zone/32867/fogbank-is-mysterious-material-used-in-nukes-thats-so-secret-nobody-can-say-what-it-is ldeo.columbia.edu/edu/eesj/gradpubs/GeneralMags/patel_chinesepurple_Archeology.pdf brill.com/view/journals/east/17/1/article-p94_6.xml pubs.rsc.org/en/content/articlehtml/2007/cs/b606268g Images: bit.ly/3wRfnlx commons.wikimedia.org/wiki/File:Vitruvius_bust_at_Technical_University_of_Munich.jpeg commons.wikimedia.org/wiki/File:20_to_40mm_recycled_aggregates_(6069277558).jpg commons.wikimedia.org/wiki/File:Puzzolane_stones_from_Vesuvius_Italy.jpg commons.wikimedia.org/wiki/File:Pouzzolane.jpg bit.ly/3tUXC2E commons.wikimedia.org/wiki/File:AAC_13.jpg commons.wikimedia.org/wiki/File:Caesarea_Concrete_Bath.jpg commons.wikimedia.org/wiki/File:Muslin_transparency_2015_Kolkata.jpg commons.wikimedia.org/wiki/File:Woman%27s_muslin_dress_and_straw_bonnet_c._1830.jpg commons.wikimedia.org/wiki/File:Ancient_Muslin_Depiction.jpg commons.wikimedia.org/wiki/File:Renaldis_muslin_woman.jpg commons.wikimedia.org/wiki/File:Victoria_Memorial_Kolkata_-_Muslin.jpg commons.wikimedia.org/wiki/File:DhakaCity1861.png commons.wikimedia.org/wiki/File:Gossypium_arboreum2.jpg bit.ly/3IVa0nO commons.wikimedia.org/wiki/File:Muslin_men.jpg commons.wikimedia.org/wiki/File:Greekfire-madridskylitzes1.jpg commons.wikimedia.org/wiki/File:Hand-siphon_for_Greek_fire,_medieval_illumination_(detail).jpg commons.wikimedia.org/wiki/File:Arbalest_flamethrower_Greek_fire,_Byzantine_Empire_(reconstruction).jpg commons.wikimedia.org/wiki/File:Trident_warheads.jpg flickr.com/photos/kevinpoh/3548617540 flickr.com/photos/carolemage/12930137013 commons.wikimedia.org/wiki/File:Recreated_colored_terracotta_warriors.jpg commons.wikimedia.org/wiki/File:Eastern_Han_Luoyang_Mural_of_Liubo_players.jpg mdpi.com/2073-4352/9/5/273/htm commons.wikimedia.org/wiki/File:Tripod_cauldron,_earthenware_with_paint,_Western_Han_Dynasty.JPG commons.wikimedia.org/wiki/File:HKU_MAG_Fung_Ping_Shan_Museum_Han_Dynasty_Horse.JPG commons.wikimedia.org/wiki/File:Egyptian_blue_Altes_Museum.JPG commons.wikimedia.org/wiki/File:Western_Han_blue_glass_bowl.JPG commons.wikimedia.org/wiki/File:British_Museum_Chinese_jade_Han_dynasty_Frog_11022019_1615.jpg commons.wikimedia.org/wiki/File:Eastern_Han_Dynasty_tomb_fresco_of_chariots,_horses,_and_men,_Luoyang_2.jpg commons.wikimedia.org/wiki/File:British_Museum_Bi_Glass_disc_Eastern_Zhou_or_Han_dynasty_11022019_1639.jpg