Hollow Earth

Sources:
-Symmes Theory of concentric spheres: https://archive.org/details/symmesstheoryofc00mcbr/page/28/mode/2up
-The smoky god (Olaf Jansen storry): https://ia902601.us.archive.org/22/items/smokygodorvoyage00emer/smokygodorvoyage00emer.pdf
-N. Kollerstrom, TThe hollow world of Edmond Halley: https://articles.adsabs.harvard.edu//full/1992JHA....23..185K/0000192.000.html
-Thomas Pynchon/ Hollow earth: https://zach-gibson.medium.com/thomas-pynchons-hollow-earth-halley-maskelyne-and-symmes-in-mason-dixon-and-against-the-day-4237e5c3edb8
-https://www.worldhistory.org/Edmond_Halley/
-https://web.archive.org/web/20101205051516/http://www.facstaff.bucknell.edu/dgriffin/Research/PGEO%2025n05_382-397-Griffin.pdf
Relating to Euler and other scientists: https://books.google.ca/books?id=uefwmdROKTAC&pg=PA138&redir_esc=y#v=onepage&q&f=false

Attributions:
-File:Hollow Earth.svg Author: Rick Manning https://commons.wikimedia.org/wiki/File:Hollow_Earth.svg
-Figure 4: Stalk solidity of synthetic hexaploid wheat grown in the greenhouse. https://www.nature.com/articles/s41598-022-08866-x
-Figure 5. Internal reinforcements in the avian bone and feather. https://www.sciencedirect.com/science/article/pii/S136970211730072X
-Vsevolod Borisovich Ivanov, several paintings used under fair use, https://www.wikiart.org/en/vsevolod-borisovich-ivanov and https://sunsofhyperborea.wordpress.com/2016/05/05/the-art-of-vsevolod-ivanov/