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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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
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https://www.flickr.com/photos/carolemage/12930137013
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https://commons.wikimedia.org/wiki/File:Eastern_Han_Luoyang_Mural_of_Liubo_players.jpg
https://www.mdpi.com/2073-4352/9/5/273/htm
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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

Видео 4 Things We've Forgotten How to Make канала SciShow