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4 Things We’ve Forgotten How to Make

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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.

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Sources:
https://www.britannica.com/technology/pozzolana
https://www.uh.edu/engines/epi2810.htm

How seawater strengthens ancient Roman concrete


https://pubs.geoscienceworld.org/msa/ammin/article/102/7/1435/353606/Phillipsite-and-Al-tobermorite-mineral-cements
https://www.smithsonianmag.com/history/the-secrets-of-ancient-romes-buildings-234992/
https://www.britannica.com/technology/concrete-building-material
https://www.britannica.com/topic/Pantheon-building-Rome-Italy

​​https://www.bbc.com/future/article/20210316-the-legendary-fabric-that-no-one-knows-how-to-make
https://uh.edu/engines/epi385.htm
https://library.oapen.org/bitstream/handle/20.500.12657/31335/631166.pdf?sequence=1#page=167

https://www.britannica.com/technology/Greek-fire
https://www.jstor.org/stable/3106585?origin=crossref
https://www.washingtonexaminer.com/weekly-standard/the-fog-of-war
https://www.thedrive.com/the-war-zone/32867/fogbank-is-mysterious-material-used-in-nukes-thats-so-secret-nobody-can-say-what-it-is

https://www.ldeo.columbia.edu/edu/eesj/gradpubs/GeneralMags/patel_chinesepurple_Archeology.pdf
https://brill.com/view/journals/east/17/1/article-p94_6.xml
https://pubs.rsc.org/en/content/articlehtml/2007/cs/b606268g

Images:
https://bit.ly/3wRfnlx
https://commons.wikimedia.org/wiki/File:Vitruvius_bust_at_Technical_University_of_Munich.jpeg
https://commons.wikimedia.org/wiki/File:20_to_40mm_recycled_aggregates_(6069277558).jpg
https://commons.wikimedia.org/wiki/File:Puzzolane_stones_from_Vesuvius_Italy.jpg
https://commons.wikimedia.org/wiki/File:Pouzzolane.jpg
https://bit.ly/3tUXC2E
https://commons.wikimedia.org/wiki/File:AAC_13.jpg
https://commons.wikimedia.org/wiki/File:Caesarea_Concrete_Bath.jpg
https://commons.wikimedia.org/wiki/File:Muslin_transparency_2015_Kolkata.jpg
https://commons.wikimedia.org/wiki/File:Woman%27s_muslin_dress_and_straw_bonnet_c._1830.jpg
https://commons.wikimedia.org/wiki/File:Ancient_Muslin_Depiction.jpg
https://commons.wikimedia.org/wiki/File:Renaldis_muslin_woman.jpg
https://commons.wikimedia.org/wiki/File:Victoria_Memorial_Kolkata_-_Muslin.jpg
https://commons.wikimedia.org/wiki/File:DhakaCity1861.png
https://commons.wikimedia.org/wiki/File:Gossypium_arboreum2.jpg
https://bit.ly/3IVa0nO
https://commons.wikimedia.org/wiki/File:Muslin_men.jpg
https://commons.wikimedia.org/wiki/File:Greekfire-madridskylitzes1.jpg
https://commons.wikimedia.org/wiki/File:Hand-siphon_for_Greek_fire,_medieval_illumination_(detail).jpg
https://commons.wikimedia.org/wiki/File:Arbalest_flamethrower_Greek_fire,_Byzantine_Empire_(reconstruction).jpg
https://commons.wikimedia.org/wiki/File:Trident_warheads.jpg
The Color of Terracotta Warriors
Hydria (ceramic water container) with Heracles and the Lernaean Hydra (an ancient serpent-like water monster), from Etruria, attributed to the Painter of Aquila, 530-500 BC, Monsters. Fantastic Creatures of Fear and Myth Exhibition, Palazzo Massimo alle T
https://commons.wikimedia.org/wiki/File:Recreated_colored_terracotta_warriors.jpg
https://commons.wikimedia.org/wiki/File:Eastern_Han_Luoyang_Mural_of_Liubo_players.jpg
https://www.mdpi.com/2073-4352/9/5/273/htm
https://commons.wikimedia.org/wiki/File:Tripod_cauldron,_earthenware_with_paint,_Western_Han_Dynasty.JPG
https://commons.wikimedia.org/wiki/File:HKU_MAG_Fung_Ping_Shan_Museum_Han_Dynasty_Horse.JPG
https://commons.wikimedia.org/wiki/File:Egyptian_blue_Altes_Museum.JPG
https://commons.wikimedia.org/wiki/File:Western_Han_blue_glass_bowl.JPG
https://commons.wikimedia.org/wiki/File:British_Museum_Chinese_jade_Han_dynasty_Frog_11022019_1615.jpg
https://commons.wikimedia.org/wiki/File:Eastern_Han_Dynasty_tomb_fresco_of_chariots,_horses,_and_men,_Luoyang_2.jpg
https://commons.wikimedia.org/wiki/File:British_Museum_Bi_Glass_disc_Eastern_Zhou_or_Han_dynasty_11022019_1639.jpg

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